llvm-project

96688d4b - [BOLT][NFC] Use brstack in guides and user outputs (#163950)

[BOLT][NFC] Use brstack in guides and user outputs (#163950) Update guides to use brstack, with a mention to BRBE for AArch64. Use brstack in user-facing outputs. --------- Co-authored-by: Amir Ayupov <aaupov@fb.com>