Use a switch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195857 91177308-0d34-0410-b5e6-96231b3b80d8
Convert two if sequences to switches.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195859 91177308-0d34-0410-b5e6-96231b3b80d8
Remove dead code.

MO_ExternalSymbol and MO_JumpTableIndex don't show up in inline asm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195861 91177308-0d34-0410-b5e6-96231b3b80d8