Silence dead store warning.  It is conceptually possible we will
add more code that references SourceFile, so removing the dead store
doesn't seem appropriate for the long term.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165837 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed