[AArch64][SVE] Asm: Add SVE (Z) Register definitions and parsing support
Patch [3/5] in a series to add assembler/disassembler support for AArch64 SVE unpredicated ADD/SUB instructions.
To summarise, this patch adds:
* SVE register definitions
* Methods to parse SVE register operands
* Methods to print SVE register operands
* RegKind SVEDataVector to distinguish it from other data types like scalar register or Neon vector.
* k_SVEDataRegister and SVEDataRegOp to describe SVE registers (which will be extended by further patches with e.g. ElementWidth and the shift-extend type).
Patch by Sander De Smalen.
Reviewed by: rengolin
Differential Revision: https://reviews.llvm.org/D39089
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317590
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