Do not insert prefetches with unsupported memory operands.

Summary:
Ignore advices where the memory operand of the 'anchor' instruction
uses unsupported register types.

Reviewers: davidxl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D54983

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@347724 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed