Merge commit f577bfb99528 from llvm-project (by Alexander Potapenko):
[sanitizer][msan] fix AArch64 vararg support for KMSAN (#70660) Cast StackSaveAreaPtr, GrRegSaveAreaPtr, VrRegSaveAreaPtr to pointers to fix assertions in getShadowOriginPtrKernel(). Fixes: https://github.com/llvm/llvm-project/issues/69738 Patch by Mark Johnston.
Requested by: markj
MFC after: 3 days
(cherry picked from commit cf675768528f22b4a9d8c70897b9ebf51da8061e)