Remove variables made dead by r155923

This makes Clang's build warning free again.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155928 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/CompilerInstance.cpp b/lib/Frontend/CompilerInstance.cpp
index 22b38c1..6f36672 100644
--- a/lib/Frontend/CompilerInstance.cpp
+++ b/lib/Frontend/CompilerInstance.cpp
@@ -859,8 +859,6 @@
   }
   
   // Determine what file we're searching from.
-  SourceManager &SourceMgr = getSourceManager();
-  SourceLocation ExpandedImportLoc = SourceMgr.getExpansionLoc(ImportLoc);
   StringRef ModuleName = Path[0].first->getName();
   SourceLocation ModuleNameLoc = Path[0].second;