[ARM] GlobalISel: Select s64 G_FCMP

Very similar to how we select s32 G_FCMP, the only thing that is
different is the exact opcodes that we use.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307763 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed