Add a cc1 "dump-coverage-mapping" for testing coverage mapping.

Differential Revision: http://reviews.llvm.org/D4799

llvm-svn: 215258
diff --git a/clang/lib/CodeGen/CoverageMappingGen.h b/clang/lib/CodeGen/CoverageMappingGen.h
index e77dedb..5a73a47 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.h
+++ b/clang/lib/CodeGen/CoverageMappingGen.h
@@ -68,7 +68,7 @@
   /// \brief Add a function's coverage mapping record to the collection of the
   /// function mapping records.
   void addFunctionMappingRecord(llvm::GlobalVariable *FunctionName,
-                                unsigned FunctionNameSize,
+                                StringRef FunctionNameValue,
                                 const std::string &CoverageMapping);
 
   /// \brief Emit the coverage mapping data for a translation unit.