[qt/clang/llvm-project]: Summary of bulk changes made

Git repository change summary for qt/clang/llvm-project
Pushed by mirror-service into branch 'upstream/users/jeanPerier/merge_memory_passes_4'.
Changed from 0000000000000000000000000000000000000000 to 50ffad6a4081c8044abb5a96fba18225838fe0a0
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit 68b9dbb7253929c8fe66826be9ece3e8ac414a82 by Jean Perier on 20/07/2026 at 16:52..
[flang] Add command-line control of allocation-placement thresholds

Expose the small-array byte-size threshold and the per-function stack budget
used by the allocation-placement pass as shared command-line options
(-allocation-placement-small-array-size and -allocation-placement-stack-limit),
and thread them through addAllocationPlacement so the pipeline honors them.
https://invent.kde.org/qt/clang/llvm-project/-/commit/68b9dbb7253929c8fe66826be9ece3e8ac414a82

Git commit 50ffad6a4081c8044abb5a96fba18225838fe0a0 by Jean Perier on 20/07/2026 at 17:22..
[flang] Enable allocation-placement pass by default

Make the unified allocation-placement pass the default in the FIR optimizer
pipeline in place of the legacy stack-arrays and memory-allocation-opt passes,
by defaulting -enable-allocation-placement to true. Passing
-enable-allocation-placement=false restores the legacy passes for comparison.

Add a -disable-allocation-placement switch that skips the pass entirely (wired
through addAllocationPlacement like the other optimizer passes), so codegen
tests can opt out of placement policy independently of the legacy fallback.

Update the pipeline-dump tests to expect AllocationPlacement, and disable the
pass in the alloca/allocmem codegen tests (alloc.fir, coordinateof.fir) so they
keep testing lowering rather than placement policy. Document the unified pass,
its policy, thresholds, and options in fstack-arrays.md.
https://invent.kde.org/qt/clang/llvm-project/-/commit/50ffad6a4081c8044abb5a96fba18225838fe0a0