A better way to silence the warning in MSVC (replaces r190304).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190308 91177308-0d34-0410-b5e6-96231b3b80d8
[ARMv8] Prevent generation of deprecated IT blocks on ARMv8 in Thumb mode.
IT blocks can only be one instruction lonf, and can only contain a subset of
the 16 instructions.

Patch by Artyom Skrobov!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190309 91177308-0d34-0410-b5e6-96231b3b80d8