tree b59a9dafa241d32a8713ecd747b6b98b649ee8f8
parent c1fcb7762673be706b0a40477d5e93411e918f93
author Chris Lattner <sabre@nondot.org> 1185089280 +0000
committer Chris Lattner <sabre@nondot.org> 1185089280 +0000

Implement a simple cache in headersearch.  This speeds up
preprocessing 483.xalancbmk by about 10%, reducing the number
of file lookup queries from 2139411 to 199466 (over 10x)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40390 91177308-0d34-0410-b5e6-96231b3b80d8