StringRef-ify Binary/UnaryOperator::getOpcodeStr

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165383 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/AnalysisBasedWarnings.cpp b/lib/Sema/AnalysisBasedWarnings.cpp
index 67d290b..6d09f2c 100644
--- a/lib/Sema/AnalysisBasedWarnings.cpp
+++ b/lib/Sema/AnalysisBasedWarnings.cpp
@@ -501,7 +501,7 @@
 
     // Information used when building the diagnostic.
     unsigned DiagKind;
-    const char *Str;
+    StringRef Str;
     SourceRange Range;
 
     // FixIts to suppress the diagnosic by removing the dead condition.