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[RISCV] add the MC layer support of riscv vector Zvamo extension

Authored by StephenFan on Jul 30 2020, 10:03 PM.

Description

[RISCV] add the MC layer support of riscv vector Zvamo extension

Implements the assemble and disassemble support of RISCV Vector
extension zvamo instructions, base on the 0.9 spec version.

Reviewed by HsiangKai

Differential Revision: https://reviews.llvm.org/D85069