[SROA] Preserve llvm.mem.parallel_loop_access metadata.

SROA doesn't preserve the llvm.mem.parallel_loop_access metadata when it
transforms loads/stores. This patch fixes a couple occurences of this
issue.

(Partially addresses PR28981).

Differential Revision: https://reviews.llvm.org/D23549



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281960 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed