Douglas Gregor e97cd90a67 Eliminate memory allocation from most invocations of ...

ModuleManager::visit() by keeping a free list of the two data
structures used to store state (a preallocated stack and a visitation
number vector). Improves -fsyntax-only performance for my modules test
case by 2.8%. Modules has pulled ahead by almost 10% with the global
module index.

llvm-svn: 173692

2013-01-28 16:46:33 +00:00

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