2050e7ebe1
This implements the base extensions that are part of the v8.9-A and v9.4-A architecture versions, including: * The Clear BHB Instruction (FEAT_CLRBHB) * The Speculation Restriction Instruction (FEAT_SPECRES2) * The SLC target for the PRFM instruction * New system registers: * ID_AA64PFR2_EL1 * ID_AA64MMFR3_EL1 * HFGITR2_EL2 * SCTLR2_EL3 More information on the new extensions can be found on: * https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/arm-a-profile-architecture-2022 * https://developer.arm.com/downloads/-/exploration-tools Contributors: Sam Elliott, Tomas Matheson and Son Tuan Vu. Reviewed By: lenary Differential Revision: https://reviews.llvm.org/D139424