[PATCH] Keep track of canonical decls in Redeclarable.

[Manuel Klimek]

Some of my measurements were wrong (testing a assertion enabled release
build against a real opt build), but it gets even better:
For one of our large TUs, this brings non-module compile time down from 36
-> 30 seconds.


http://reviews.llvm.org/D8619

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/