When the template specialization header is missing, set a valid source location for the template keyword when recovering.

Otherwise ClassTemplateSpecializationDecl::getSourceRange() will mistakenly consider itself as an implicit partial specialization
and lead to a crash.

Fixes rdar://14063074

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183325 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaTemplate.cpp b/lib/Sema/SemaTemplate.cpp
index ad866a3..8621a2d 100644
--- a/lib/Sema/SemaTemplate.cpp
+++ b/lib/Sema/SemaTemplate.cpp
@@ -5300,6 +5300,7 @@
   } else if (TUK != TUK_Friend) {
     Diag(KWLoc, diag::err_template_spec_needs_header)
       << FixItHint::CreateInsertion(KWLoc, "template<> ");
+    TemplateKWLoc = KWLoc;
     isExplicitSpecialization = true;
   }