[PATCH] Fix null pointer segfault when calling dump() on a DeclStmt containing a VarDecl.

[Alex McCarthy]

Hi jordan_rose,

http://reviews.llvm.org/D3589

Files:
  lib/AST/ASTDumper.cpp

Index: lib/AST/ASTDumper.cpp
===================================================================
--- lib/AST/ASTDumper.cpp
+++ lib/AST/ASTDumper.cpp
@@ -444,6 +444,9 @@
 }
 
 void ASTDumper::dumpLocation(SourceLocation Loc) {
+  if (!SM)
+    return;
+
   ColorScope Color(*this, LocationColor);
   SourceLocation SpellingLoc = SM->getSpellingLoc(Loc);
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