"Reapply "[llvm-jitlink] Use concurrent linking by default." with more fixes.

This reapplies edca1d9bad2 which was reverted in 7ec139ad4bc due to bot
failures.

LocalDependencyPropagation.s is updat

"Reapply "[llvm-jitlink] Use concurrent linking by default." with more fixes.

This reapplies edca1d9bad2 which was reverted in 7ec139ad4bc due to bot
failures.

LocalDependencyPropagation.s is updated to use -num-threads=0 in order to
avoid interleaving debugging output.

ELFNixPlatform.h is updated to protect the deferred runtime function calls
map during bootstrap.

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Revert "Reapply "[llvm-jitlink] Use concurrent linking by default." with fixes. (#120958)"

Caused random failures.

This reverts commit 93d4b1f7a72f366c1ea91b2d65991266053be8d9.
(llvmorg-20-init-162

Revert "Reapply "[llvm-jitlink] Use concurrent linking by default." with fixes. (#120958)"

Caused random failures.

This reverts commit 93d4b1f7a72f366c1ea91b2d65991266053be8d9.
(llvmorg-20-init-16299-g93d4b1f7a72f)

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Reapply "[llvm-jitlink] Use concurrent linking by default." with fixes. (#120958)

Reapplies commit edca1d9bad2 which was reverted in 34531cff638 while I
investigated bot failures, (e.g.
https://la

Reapply "[llvm-jitlink] Use concurrent linking by default." with fixes. (#120958)

Reapplies commit edca1d9bad2 which was reverted in 34531cff638 while I
investigated bot failures, (e.g.
https://lab.llvm.org/buildbot/#/builders/137/builds/10791).

Commit 158a60051d2 should address the -check failures on the bots, which
were caused by checks running earlier under the concurrent linking
scheme before all files referenced by the checks had been fully linked.
This patch also fixes the -threads option failure by renaming the option
to -num-threads to avoid clashing with the ThreadCount cl::opt variable
defined in ThinLTOCodeGenerator.cpp.

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Revert "[llvm-jitlink] Use concurrent linking by default."

This reverts commit edca1d9bad2 while I investigate bot failures,
e.g. https://lab.llvm.org/buildbot/#/builders/137/builds/10791.

[llvm-jitlink] Use concurrent linking by default.

Adds a -threads option to llvm-jitlink. By default llvm-jitlink will now use a
DynamicThreadPoolTaskDispatcher with the number of materialization th

[llvm-jitlink] Use concurrent linking by default.

Adds a -threads option to llvm-jitlink. By default llvm-jitlink will now use a
DynamicThreadPoolTaskDispatcher with the number of materialization threads set
to whatever is returned by std::hardware_concurrency(). This brings the default
in-place linking behavior in line with the concurrent linking that is used for
-oop-executor and -oop-executor-connect mode.

In-place linking on the main thread can be forced by passing -threads=0.

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[llvm-jitlink] Refactor GOT and stubs registration (NFC) (#78365)

Add methods `registerGOTEntry()` and `registerStubEntry()` in
`Session::FileInfo` to factor out generic code from the individual
o

[llvm-jitlink] Refactor GOT and stubs registration (NFC) (#78365)

Add methods `registerGOTEntry()` and `registerStubEntry()` in
`Session::FileInfo` to factor out generic code from the individual
object type implementations.

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[jitlink][rtdyld][checker] Re-apply 4b17c81d5a5 with fixes.

This re-applies 4b17c81d5a5, "[jitlink/rtdydl][checker] Add TargetFlag
dependent disassembler switching support", which was reverted in
48

[jitlink][rtdyld][checker] Re-apply 4b17c81d5a5 with fixes.

This re-applies 4b17c81d5a5, "[jitlink/rtdydl][checker] Add TargetFlag
dependent disassembler switching support", which was reverted in
4871a9ca546 due to bot failures.

The patch has been updated to add missing plumbing for Subtarget Features and
a CPU string, which should fix the failing tests.

https://reviews.llvm.org/D158280

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Revert "[jitlink/rtdydl][checker] Add TargetFlag dependent disassembler switching support"

This reverts commit 4b17c81d5a5d3e0f514026c2b7f9b623d901cc04.

Caused buildbot failures:
https://lab.llvm.o

Revert "[jitlink/rtdydl][checker] Add TargetFlag dependent disassembler switching support"

This reverts commit 4b17c81d5a5d3e0f514026c2b7f9b623d901cc04.

Caused buildbot failures:
https://lab.llvm.org/buildbot/#/builders/230/builds/18341
https://lab.llvm.org/buildbot/#/builders/109/builds/73169
https://lab.llvm.org/buildbot/#/builders/67/builds/12597

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[jitlink/rtdydl][checker] Add TargetFlag dependent disassembler switching support

Some targets such as AArch32 make use of TargetFlags to indicate ISA mode. Depending
on the TargetFlag, MCDisassembl

[jitlink/rtdydl][checker] Add TargetFlag dependent disassembler switching support

Some targets such as AArch32 make use of TargetFlags to indicate ISA mode. Depending
on the TargetFlag, MCDisassembler and similar target specific objects should be
reinitialized with the correct Target Triple. Backends with similar needs can
easily extend this implementation for their usecase.

The drivers llvm-rtdyld and llvm-jitlink have their SymbolInfo's extended to take
TargetFlag into account. RuntimeDyldChecker can now create necessary TargetInfo
to reinitialize MCDisassembler and MCInstPrinter. The required triple is obtained
from the new getTripleFromTargetFlag function by checking the TargetFlag.

In addition, breaking changes for RuntimeDyld COFF Thumb tests are fixed by making
the backend emit a TargetFlag.

Reviewed By: lhames, sgraenitz

Differential Revision: https://reviews.llvm.org/D158280

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[llvm] Use x.empty() instead of llvm::empty(x) (NFC)

I'm planning to deprecate and eventually remove llvm::empty.

I thought about replacing llvm::empty(x) with std::empty(x), but it
turns out that

[llvm] Use x.empty() instead of llvm::empty(x) (NFC)

I'm planning to deprecate and eventually remove llvm::empty.

I thought about replacing llvm::empty(x) with std::empty(x), but it
turns out that all uses can be converted to x.empty(). That is, no
use requires the ability of std::empty to accept C arrays and
std::initializer_list.

Differential Revision: https://reviews.llvm.org/D133677

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[llvm] Use llvm::find_if (NFC)

[JITLink][COFF] Initial COFF support.

Adds initial COFF support in JITLink. This is able to run a hello world c program in x86 windows successfully.

Implemented
- COFF object loader
- Static local

[JITLink][COFF] Initial COFF support.

Adds initial COFF support in JITLink. This is able to run a hello world c program in x86 windows successfully.

Implemented
- COFF object loader
- Static local symbols
- Absolute symbols
- External symbols
- Weak external symbols
- Common symbols
- COFF jitlink-check support
- All COMDAT selection type execpt largest
- Implicit symobl size calculation
- Rel32 relocation with PLT stub.
- IMAGE_REL_AMD64_ADDR32NB relocation

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D128968

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