r237326 - Add missing #include, found by modules build.

[Richard Smith]

Author: rsmith
Date: Wed May 13 20:08:58 2015
New Revision: 237326

URL: http://llvm.org/viewvc/llvm-project?rev=237326&view=rev
Log:
Add missing #include, found by modules build.

Modified:
    cfe/trunk/include/clang/Lex/ExternalPreprocessorSource.h

Modified: cfe/trunk/include/clang/Lex/ExternalPreprocessorSource.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Lex/ExternalPreprocessorSource.h?rev=237326&r1=237325&r2=237326&view=diff
==============================================================================
--- cfe/trunk/include/clang/Lex/ExternalPreprocessorSource.h (original)
+++ cfe/trunk/include/clang/Lex/ExternalPreprocessorSource.h Wed May 13 20:08:58 2015
@@ -17,6 +17,7 @@
 namespace clang {
 
 class IdentifierInfo;
+class Module;
 
 /// \brief Abstract interface for external sources of preprocessor 
 /// information.