Read/write more information of ASTContext for PCH. Overriden methods and instantiated-from information.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107597 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclCXX.cpp b/lib/AST/DeclCXX.cpp
index 7ce9c64..19c3ac1 100644
--- a/lib/AST/DeclCXX.cpp
+++ b/lib/AST/DeclCXX.cpp
@@ -716,6 +716,10 @@
   return getASTContext().overridden_methods_end(this);
 }
 
+unsigned CXXMethodDecl::size_overridden_methods() const {
+  return getASTContext().overridden_methods_size(this);
+}
+
 QualType CXXMethodDecl::getThisType(ASTContext &C) const {
   // C++ 9.3.2p1: The type of this in a member function of a class X is X*.
   // If the member function is declared const, the type of this is const X*,