[BOLT] Sort BranchData in DataAggregator

Align perf reader to fdata behavior by sorting BranchData after reading samples,
in the same way as DataReader:
https://github.com/llvm/llvm-project/blob/20c

[BOLT] Sort BranchData in DataAggregator

Align perf reader to fdata behavior by sorting BranchData after reading samples,
in the same way as DataReader:
https://github.com/llvm/llvm-project/blob/20c66a0c66340f44f04b6526e45bcc5d872d480a/bolt/lib/Profile/DataReader.cpp#L1239

Namely, that order affects CallSiteInfo annotations which determine the
construction order of CallGraph, which in turn affects function reordering.

Reviewed By: #bolt, rafauler

Differential Revision: https://reviews.llvm.org/D152731

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[BOLT] Remove dependency on StringMap iteration order

Remove the usage of StringMap in places where the iteration order
affects the output since the iteration over StringMap is
non-deterministic.

R

[BOLT] Remove dependency on StringMap iteration order

Remove the usage of StringMap in places where the iteration order
affects the output since the iteration over StringMap is
non-deterministic.

Reviewed By: Amir

Differential Revision: https://reviews.llvm.org/D145194

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[BOLT][TEST] Use double dash flags in tests

Replace a single dash with a double dash for options that have more
than a single letter.

llvm-bolt-wrapper.py has special treatment for output options s

[BOLT][TEST] Use double dash flags in tests

Replace a single dash with a double dash for options that have more
than a single letter.

llvm-bolt-wrapper.py has special treatment for output options such as
"-o" and "-w" causing issues when a single dash is used, e.g. for
"-write-dwp". The wrapper can be fixed as well, but using a double dash
has other advantages as well.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D127538

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[BOLT] Improve cmake configs for opensource

Summary:
Change cmake config in BOLT to only support Linux. In other
platforms, we print a warning that we won't build BOLT. Change
configs to determine

[BOLT] Improve cmake configs for opensource

Summary:
Change cmake config in BOLT to only support Linux. In other
platforms, we print a warning that we won't build BOLT. Change
configs to determine whether we will build BOLT runtime libs. This
only happens in x86 hosts. If true, we will build the runtime and
enable bolt-runtime tests. New tests that depend on the bolt_rt lib
needs to be marked REQUIRES:bolt-runtime. I updated the relevant
tests. Fix cmake to do not crash when building llvm with a target
that BOLT does not support.

(cherry picked from FBD31935760)

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[BOLT][TEST] Split runtime tests into test/runtime folder

Summary:
Create bolt/test/runtime folder and move tests that execute the binary.
Move lit.local.cfg with host_arch check to the correspondin

[BOLT][TEST] Split runtime tests into test/runtime folder

Summary:
Create bolt/test/runtime folder and move tests that execute the binary.
Move lit.local.cfg with host_arch check to the corresponding folder.
Addresses issue facebookincubator/BOLT#132.

AArch64/tls.c shows a different behavior with clang hence marked as XFAIL

TODO: add a check for non-exec tests for a corresponding LLVM_TARGETS_TO_BUILD.

(cherry picked from FBD31132234)

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