#1674
Describe the second outliner pass on Linux x86_64
Summary
- The PGSO README and the comment in
candidate_object_argvnow say the second machine outliner pass runs wherever the outliner runs, which includes cold code on Linux x86_64 since #1628. - They also say the shared frame helpers from LLVM's homogeneous prologue and epilogue are AArch64 only.
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