[PATCH] D155932: [WIP][RISCV] Add subclasses of Sched to simplify code

[Wang Pengcheng via Phabricator via llvm-commits]

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We add some subclasses of Sched to reduce code which cast string
to `SchedWrite`/`SchedRead`.

Besides, we add `ReadVMask` iff pseudo is masked. And this is the
reason why this patch isn't a NFC since we add it for all pseudos
before.

`ReadMergeOp` will be added in D155654 <https://reviews.llvm.org/D155654>.

(This patch is WIP and only a small part of code are changed to show
the difference. If we all agree with this kind change, I will finish
it next week).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155932

Files:
  llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td

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