[all-commits] [llvm/llvm-project] 1ec9dd: [sancov] Refactor getPreviousInstructionPc

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1ec9dd3aae0b8c90a91f845ad629ef7d199986c0
      https://github.com/llvm/llvm-project/commit/1ec9dd3aae0b8c90a91f845ad629ef7d199986c0
  Author: Fangrui Song <i at maskray.me>
  Date:   2022-02-22 (Tue, 22 Feb 2022)

  Changed paths:
    M llvm/tools/sancov/sancov.cpp

  Log Message:
  -----------
  [sancov] Refactor getPreviousInstructionPc

Note: on some architectures lik AArch64, the PC does not match
compiler-rt/lib/sanitizer_common/sanitizer_coverage_libcdep_new.cpp:`__sanitizer_cov_trace_pc_guard`