r120013 dropped passing in the precomputed file size to 
MemoryBuffer::getFile, causing us to pick up a fstat for
every file.  Restore the optimization.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120032 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed