Commits on Apr 12, 2023

1. JIT: extend initial profile repair to more cases …

   In particular, fill in profiles for cases where we have an incomplete
   dynamic profile because a method rapidly transitions to OSR, and
   that method has important code that is not observed to execute by Tier0
   instrumentation (things that happen after the OSR triggering loop exits)
   so having zero profiles for the remainder causes significant perf
   degradation.
   
   Filling in the missing profile data entails:
   * Allowing repair mode to reset exit likelihoods on zero-weight blocks as
   well as on inconsistent blocks. Since PGO never saw these blocks run,
   it has no opinion on their exit likelihoods.
   * Adjust loop exit edge likelihoods if we end up capping the cyclic
   probability in the loop, so that some profile weight will exit the loop
   and light up any previously zero weight blocks that may follow.

   

   AndyAyersMS committed Apr 12, 2023
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