From @indygreg 's #101093

TODO

• Optional -fno-reorder-blocks-and-partition
• Drop -gdwarf-4
• Run BOLT instrumented binary with `$(RUNSHARED)``
• Enable BOLT optimization of libpython

Linked PRs

• gh-101282: Update BOLT --split-functions flag not to use deprecated u… #101557
• gh-101282: move BOLT config after PGO #104493
• gh-101282: Apply BOLT optimisations to libpython for shared builds #104709
• gh-101282: Revert some M4 style for BOLT configuration #104751
• gh-101282: Enclose BOLT_APPLY_FLAGS value in double quotes #104752
• gh-101282: Group and quote BOLT CLI flags #104821
• [3.12] gh-101282: Enclose BOLT_APPLY_FLAGS value in double quotes (gh-104752) #104853