Map compilation units using FileEntry pointers instead of
FileIDs. This seems better conceptually and lets the SourceManager
handle details of mapping the location to a file ID.
 - In practice, fixes an assert because this code wasn't using
   getPhysicalLoc.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58055 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDebugInfo.h b/lib/CodeGen/CGDebugInfo.h
index 9352505..07d5b54 100644
--- a/lib/CodeGen/CGDebugInfo.h
+++ b/lib/CodeGen/CGDebugInfo.h
@@ -57,7 +57,7 @@
   typedef llvm::IRBuilder<> BuilderType;
 
   /// CompileUnitCache - Cache of previously constructed CompileUnits.
-  std::map<unsigned, llvm::CompileUnitDesc *> CompileUnitCache;
+  std::map<const FileEntry*, llvm::CompileUnitDesc *> CompileUnitCache;
 
   /// TypeCache - Cache of previously constructed Types.
   std::map<void *, llvm::TypeDesc *> TypeCache;