[AArch64] Reject inline asm with FP registers when FP is disabled.

Otherwise, we would crash trying to deal with an illegal input.

Differential Revision: https://reviews.llvm.org/D51202



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340637 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed