Fix local variable name /NFC

llvm-svn: 258106
diff --git a/clang/lib/CodeGen/CoverageMappingGen.h b/clang/lib/CodeGen/CoverageMappingGen.h
index 9ae2bcff..70aed84 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.h
+++ b/clang/lib/CodeGen/CoverageMappingGen.h
@@ -72,7 +72,7 @@
                                 StringRef FunctionNameValue,
                                 uint64_t FunctionHash,
                                 const std::string &CoverageMapping,
-                                bool isUsed = true);
+                                bool IsUsed = true);
 
   /// \brief Emit the coverage mapping data for a translation unit.
   void emit();