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[RISCV] Rename Zbs instructions to start with just 'b' instead of 'sb' to match…

Authored by craig.topper on Jan 22 2021, 11:32 AM.

Description

[RISCV] Rename Zbs instructions to start with just 'b' instead of 'sb' to match 0.93 bitmanip spec.

Also renamed Zbe instructions to resolve name conflict even though
that change is in the 0.94 draft.

Reviewed By: asb, frasercrmck

Differential Revision: https://reviews.llvm.org/D94653