Fix comment.

llvm-svn: 75471
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index e45fa55..9bab926 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -732,7 +732,7 @@
   if (Ty.isNull())
     return llvm::DIType();
   
-  // Check to see if the compile unit already has created this type.
+  // Check TypeCache first.
   llvm::DIType &Slot = TypeCache[Ty.getAsOpaquePtr()];
   if (!Slot.isNull()) return Slot;