fcad2bbcfc
Currently LLVM emits Ztso code for fences, loads, and stores (behind an experimental flag) [1]. This patch updates the mapping and implements support for LR/SC and AMO ops. This updated mapping is compatible with the RVWMO ABI present in the psABI. Additional context can be found in the psABI pull request [2]. [1] https://reviews.llvm.org/D143076 [2] https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/391 Differential Revision: https://reviews.llvm.org/D155517
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