Add a new portability macro LLVM_FUNCTION_NAME, that expands to __func__, if
supported.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172156 91177308-0d34-0410-b5e6-96231b3b80d8
X86AsmParser.cpp: Fix up r172148, to add initializer in another CreateMem().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172157 91177308-0d34-0410-b5e6-96231b3b80d8