[x86][AVX512][FEAT] Memory broadcasting suffixes ({1to8}, {1to16}) support for x86 assembler.

[Zinovy Nis]

Please review my patch.

This patch:

   - Makes x86 assembler (llvm-mc) recognize and parse memory broadcasting
   primitives from AVX512: {1to8} and {1to16}.
   - Makes x86 assembler accept both Intel- and AT&T-styled AVX512 operands
   primitives. Affects {1to<NUM>}, {%k<NUM>} and {z}.
   - Adds simple tests for {1to8} and {1to16} parsing.
   - Slightly clean-ups X86AsmParser.cpp.
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