[utils] Support -mtriple=powerpc64

Summary: test/CodeGen/PowerPC/pr33093.ll uses both powerpc64 (big-endian) and powerpc64le while the former was unsupported.

Subscribers: nemanjai

Differential Revision: https://reviews.llvm.org/D39164

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316297 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed