Apply llvm fix for hanging gcc builds on 32-bit arm

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)