Fix a minor thinko that leads to a crash if PatternDecl is null but
Pattern is not. Thanks Nick for catching this!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132089 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 701493c..3c0d34b 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -2318,11 +2318,12 @@
   // Find the function body that we'll be substituting.
   const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern();
   Stmt *Pattern = 0;
-  if (PatternDecl)
+  if (PatternDecl) {
     Pattern = PatternDecl->getBody(PatternDecl);
-  if (!Pattern)
-    // Try to find a defaulted definition
-    PatternDecl->isDefined(PatternDecl);
+    if (!Pattern)
+      // Try to find a defaulted definition
+      PatternDecl->isDefined(PatternDecl);
+  }
 
   // Postpone late parsed template instantiations.
   if (PatternDecl && PatternDecl->isLateTemplateParsed() &&