Fix the signature of the getcontext builtin. Patch by Dimitry Andric.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144505 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Serialization/ASTBitCodes.h b/include/clang/Serialization/ASTBitCodes.h
index 1449ee7..e3a1020 100644
--- a/include/clang/Serialization/ASTBitCodes.h
+++ b/include/clang/Serialization/ASTBitCodes.h
@@ -700,7 +700,9 @@
       /// \brief Objective-C "Class" redefinition type
       SPECIAL_TYPE_OBJC_CLASS_REDEFINITION     = 7,
       /// \brief Objective-C "SEL" redefinition type
-      SPECIAL_TYPE_OBJC_SEL_REDEFINITION       = 8
+      SPECIAL_TYPE_OBJC_SEL_REDEFINITION       = 8,
+      /// \brief C ucontext_t typedef type
+      SPECIAL_TYPE_UCONTEXT_T                  = 9
     };
     
     /// \brief The number of special type IDs.