add null pointer check

[Mathieu Baudet via cfe-commits]

Hello,

While running some private CSA checkers on a recent checkout of clang (dev), I 
found the following fix to be necessary to prevent a null pointer error in 
lib/StaticAnalyzer/Core/IssueHash.cpp

— Mathieu




diff --git a/lib/StaticAnalyzer/Core/IssueHash.cpp 
b/lib/StaticAnalyzer/Core/IssueHash.cpp
--- a/lib/StaticAnalyzer/Core/IssueHash.cpp
+++ b/lib/StaticAnalyzer/Core/IssueHash.cpp
@@ -128,6 +128,9 @@ static StringRef GetNthLineOfFile(llvm::MemoryBuffer 
*Buffer, int Line) {
 
 static std::string NormalizeLine(const SourceManager &SM, FullSourceLoc &L,
                                  const Decl *D) {
+  if (!D)
+    return "";
+
   static StringRef Whitespaces = " \t\n";
 
   const LangOptions &Opts = D->getASTContext().getLangOpts();

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