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[RISCV] add the assemble and disassemble support of Zvlsseg instructions

Authored by StephenFan on Jul 22 2020, 10:45 PM.

Description

[RISCV] add the assemble and disassemble support of Zvlsseg instructions

This implements the assemble and disassemble support of RISCV Vector
extension Zvlsseg instructions, base on the 0.9 spec version.

Reviewed by HsiangKai

Differential Revision: https://reviews.llvm.org/D84416