[PATCH] [LPM] A targeted but somewhat horrible fix to the legacy pass manager's querying of the pass registry.

Owen Anderson resistor at mac.com
Tue Jan 27 16:56:00 PST 2015

Hi Chandler,

In my measurements, this captures about half of the regression, i.e. the regression goes from ~20% to ~10%.  While the reader/writer locks are gone from the profile, several other PassManager related pieces of code have jumped up to take their place:


- F362108: ThreadProfile2.png <http://reviews.llvm.org/F362108>



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