Rework HeaderSearch's interface for getting a module from a name and
for getting the name of the module file, unifying the code for
searching for a module with a given name (into lookupModule()) and
separating out the mapping to a module file (into
getModuleFileName()). No functionality change.

llvm-svn: 149197
diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp
index 5dda964..05cbffd 100644
--- a/clang/lib/Lex/Preprocessor.cpp
+++ b/clang/lib/Lex/Preprocessor.cpp
@@ -383,7 +383,7 @@
   if (getLangOptions().CurrentModule.empty())
     return 0;
   
-  return getHeaderSearchInfo().getModule(getLangOptions().CurrentModule);
+  return getHeaderSearchInfo().lookupModule(getLangOptions().CurrentModule);
 }
 
 //===----------------------------------------------------------------------===//