Introduce non-const Decl::getParentFunctionOrMethod.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140707 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/AST/DeclBase.h b/include/clang/AST/DeclBase.h
index 2a2f810..7e093c8 100644
--- a/include/clang/AST/DeclBase.h
+++ b/include/clang/AST/DeclBase.h
@@ -574,6 +574,10 @@
   /// \brief If this decl is defined inside a function/method/block it returns
   /// the corresponding DeclContext, otherwise it returns null.
   const DeclContext *getParentFunctionOrMethod() const;
+  DeclContext *getParentFunctionOrMethod() {
+    return const_cast<DeclContext*>(
+                    const_cast<const Decl*>(this)->getParentFunctionOrMethod());
+  }
 
   /// \brief Retrieves the "canonical" declaration of the given declaration.
   virtual Decl *getCanonicalDecl() { return this; }