ARM: produce friendly error for invalid inline asm

We used to perform an invalid operation on an MVT and crash, which wasn't much
fun.

Patch by Oliver Stannard.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194714 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed