Garvit Gupta 4c37d30e22 [RISCV] Add support for custom instructions for Sifive S76. ...

Support for below instruction is added
1. CFLUSH.D.L1
2. CDISCARD.D.L1
3. CEASE

Additionally, Zihintpause extension is added to sifive s76 for pause
instruction.

Spec - https://sifive.cdn.prismic.io/sifive/767804da-53b2-4893-97d5-b7c030ae0a94_s76mc_core_complex_manual_21G3.pdf

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D153370

2023-06-26 11:36:00 -07:00

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