Pete Cooper 59023bf389 Avoid dsymutil calls to getFileNameByIndex.
This change adds a hasFileAtIndex method. getChildDeclContext can first call this method, and if it returns true it knows it can then lookup the resolved path cache for the given file index. If we hit that cache then we don't even have to call getFileNameByIndex.

Running dsymutil against the swift executable built from github gives a 20% performance improvement without any change in the binary.

Differential Revision: https://reviews.llvm.org/D22655

Reviewed by friss.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276380 91177308-0d34-0410-b5e6-96231b3b80d8
2016-07-22 01:41:32 +00:00
..
2016-07-16 02:24:59 +00:00