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[RISCV] Add Clang frontend support for Bitmanip extension

Authored by s.egerton on Apr 9 2020, 9:51 AM.

Description

[RISCV] Add Clang frontend support for Bitmanip extension

This adds the __riscv_bitmanip macro and the 'b' target feature to enable it.

Differential Revision: https://reviews.llvm.org/D71553

Details