llvm/test/Transforms/LoopStrengthReduce/ARM64/lsr-*.ll: Add explicit triple arm64-unknown for targeting pecoff.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205125 91177308-0d34-0410-b5e6-96231b3b80d8
Suppress llvm/test/CodeGen/ARM64 for targeting pecoff. ARM64 is unaware of that.

FIXME: Could we support them?

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205126 91177308-0d34-0410-b5e6-96231b3b80d8