[RemoveDIs] Print IR with debug records by default (#91724)

This patch makes the final major change of the RemoveDIs project, changing the
default IR output from debug intrinsics to debug records.

[RemoveDIs] Print IR with debug records by default (#91724)

This patch makes the final major change of the RemoveDIs project, changing the
default IR output from debug intrinsics to debug records. This is expected to
break a large number of tests: every single one that tests for uses or
declarations of debug intrinsics and does not explicitly disable writing
records.

If this patch has broken your downstream tests (or upstream tests on a
configuration I wasn't able to run):
1. If you need to immediately unblock a build, pass
`--write-experimental-debuginfo=false` to LLVM's option processing for all
failing tests (remember to use `-mllvm` for clang/flang to forward arguments to
LLVM).
2. For most test failures, the changes are trivial and mechanical, enough that
they can be done by script; see the migration guide for a guide on how to do
this: https://llvm.org/docs/RemoveDIsDebugInfo.html#test-updates
3. If any tests fail for reasons other than FileCheck check lines that need
updating, such as assertion failures, that is most likely a real bug with this
patch and should be reported as such.

For more information, see the recent PSA:
https://discourse.llvm.org/t/psa-ir-output-changing-from-debug-intrinsics-to-debug-records/79578

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[DebugInfo] Convert tests to opaque pointers (NFC)

Link: https://discourse.llvm.org/t/enabling-opaque-pointers-by-default/61322

[RemoveDIs][DebugInfo] Handle DPVAssign in most transforms (#78986)

This patch trivially updates various opt passes to handle DPVAssigns. In
all cases, this means some combination of generifying ex

[RemoveDIs][DebugInfo] Handle DPVAssign in most transforms (#78986)

This patch trivially updates various opt passes to handle DPVAssigns. In
all cases, this means some combination of generifying existing code to
handle DPValues and DbgAssignIntrinsics, iterating over DPValues where
previously we did not, or duplicating code for DbgAssignIntrinsics to
the equivalent DPValue function (in inlining and salvageDebugInfo).

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[Assignment Tracking][NFC] Replace LLVM command line option with a module flag

Remove LLVM flag -experimental-assignment-tracking. Assignment tracking is
still enabled from Clang with the command li

[Assignment Tracking][NFC] Replace LLVM command line option with a module flag

Remove LLVM flag -experimental-assignment-tracking. Assignment tracking is
still enabled from Clang with the command line -Xclang
-fexperimental-assignment-tracking which tells Clang to ask LLVM to run the
pass declare-to-assign. That pass converts conventional debug intrinsics to
assignment tracking metadata. With this patch it now also sets a module flag
debug-info-assignment-tracking with the value `i1 true` (using the flag conflict
rule `Max` since enabling assignment tracking on IR that contains only
conventional debug intrinsics should cause no issues).

Update the docs and tests too.

Reviewed By: CarlosAlbertoEnciso

Differential Revision: https://reviews.llvm.org/D142027

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[Assignment Tracking][14/*] Account for assignment tracking in instcombine

The Assignment Tracking debug-info feature is outlined in this RFC:

https://discourse.llvm.org/t/
rfc-assignment-tracking-

[Assignment Tracking][14/*] Account for assignment tracking in instcombine

The Assignment Tracking debug-info feature is outlined in this RFC:

https://discourse.llvm.org/t/
rfc-assignment-tracking-a-better-way-of-specifying-variable-locations-in-ir

Most of the updates here are just to ensure DIAssignID attachments are
maintained and propagated correctly.

Reviewed By: jmorse

Differential Revision: https://reviews.llvm.org/D133307

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