[LV] Align debug location of the widen-phi to the original phi. (#120338)

This patch align the debug location of the widen-phi to the debug
location of original phi.

Split from: #120054

[LLVM][IR] Use splat syntax when printing Constant[Data]Vector. (#112548)

[VPlan] Run VPlan optimizations on plans in native path.

Update buildVPlans (used in native path) to also run general VPlan
optimizations in another small step to align both codepaths.

[VPlan] Update HCFG builder after 72937203dd3b to fix leak.

Update buildPlainCFG to re-use the vector and latch VPBBs created as
part of the initial skeleton in 72937203dd3b.

This should fix the le

[VPlan] Update HCFG builder after 72937203dd3b to fix leak.

Update buildPlainCFG to re-use the vector and latch VPBBs created as
part of the initial skeleton in 72937203dd3b.

This should fix the leak sanitizer failure discovered by
https://lab.llvm.org/buildbot/#/builders/52/builds/619.

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[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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[VPlan] Use VPBuilder to create BranchOnCond in VPHCFGBuilder.

This simplifies the code to create the recipe slightly as well as
properly retaining the debug location of the input IR.

[LV] Skipping all debug instructions when native vplan is enabled (#77413)

The following internal error occurred when using native vplan to
vectorize the program with the debug info generation.

[LV] Skipping all debug instructions when native vplan is enabled (#77413)

The following internal error occurred when using native vplan to
vectorize the program with the debug info generation.

Assertion `!isa<DbgInfoIntrinsic>(CI) && "DbgInfoIntrinsic should have been dropped during VPlan construction"' failed.

This patch ignored all debug instructions to fix the error when native
vplan is enabled.

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