[PATCH][Review request] add support for ADX instructions (PR15235)

[Kay Tiong Khoo]

http://llvm.org/bugs/show_bug.cgi?id=15235

Please review the attached patch which adds support for Intel's ADX
instructions.

The patch includes:
1. Addition of "HasADX" flag.
2. Definitions for new instructions
3. Disassembly tests
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