Apply llvm fix for hanging gcc builds on 32-bit arm
Merge commit 962c306a11d0 from llvm-project (by Florian Hahn):
[LV] Don't consider pointer as uniform if it is also stored. Update isVectorizedMemAccessUse to also check if the pointer is stored. This prevents LV to incorrectly consider a pointer as uniform if it is used as both pointer and stored by the same StoreInst. Fixes #61396.
PR: 271992
Reported by: John F. Carr <jfc@mit.edu>
MFC after: 3 days
(cherry picked from commit dbbaf77801a8f30e49731395e85757f339f345bf)