(LLVM part) Implement MASM-flavor intel syntax behavior for inline MS asm block: 1. 0xNN and NNh are accepted as valid hexadecimal numbers, but 0xNNh is not. 0xNN and NNh may come with optional U or L suffix. 2. NNb is accepted as a valid binary (base-2) number, but 0bNN is not. NNb may come with optional U or L suffix.
Differential Revision: https://reviews.llvm.org/D22112