[BUG] clang frontend crashes on both r26d and canary version

[yujincheng08]

Description

https://godbolt.org/z/3cd8nYMh5

Upstream bug

llvm/llvm-project#88400

Commit to cherry-pick

llvm/llvm-project@487967a

Affected versions

r26, Canary

Canary version

28.0.11699160

Host OS

Linux, Mac, Windows

Host OS version

11

Affected ABIs

armeabi-v7a, arm64-v8a, x86, x86_64

[pirama-arumuga-nainar]

The godbolt repro crashes back to clang 16. This is not a regression, so we will cherry-pick the fix to r27.

[DanAlbert]

Switching godbolt over to the assertions enabled clang shows an assertion failure: https://godbolt.org/z/xh35qaoed

It also fails consistently from clang 16 through HEAD, so not a regression. We might be able to pick up the fix for r27, depending on how invasive it is, but getting the fix into r26e (which isn't currently planned, as there are no regressions against it) seems unlikely.

[DanAlbert]

(thank you for the quality bug report, btw, that makes things much easier)

[yujincheng08]

upstream fixed: llvm/llvm-project@487967a

[pirama-arumuga-nainar]

https://r.android.com/3075606 picks the fix into AOSP toolchain. We'll include the fix in r27.