Add parser support for static_assert.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66661 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/Parser.cpp b/lib/Parse/Parser.cpp
index b66b4f3..5666051 100644
--- a/lib/Parse/Parser.cpp
+++ b/lib/Parse/Parser.cpp
@@ -408,6 +408,7 @@
   case tok::kw_typedef:
   case tok::kw_template:
   case tok::kw_export:    // As in 'export template'
+  case tok::kw_static_assert:
     // A function definition cannot start with a these keywords.
     return ParseDeclaration(Declarator::FileContext);
   default: