Add basic (noop) CodeGen support for __assume

Clang supports __assume, at least at the semantic level, when MS extensions are
enabled. Unfortunately, trying to actually compile code using __assume would
result in this error:

  error: cannot compile this builtin function yet

__assume is an optimizer hint, and can be ignored at the IR level. Until LLVM
supports assumptions at the IR level, a noop lowering is valid, and that is
what is done here.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213206 91177308-0d34-0410-b5e6-96231b3b80d8