[ARM] GlobalISel: Lower single precision FP args

Both for aapcscc and aapcs_vfpcc. We currently filter out soft float targets
because we don't support libcalls yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294584 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed