Add support for parsing and representing C++ constructor declarations.

Notes:
  - Constructors are never found by name lookup, so they'll never get
    pushed into any scope. Instead, they are stored as an 
    OverloadedFunctionDecl in CXXRecordDecl for easy overloading.
  - There's a new action isCurrentClassName that determines whether an
    identifier is the name of the innermost class currently being defined;
    we use this to identify the declarator-id grammar rule that refers to 
    a type-name. 
  - MinimalAction does *not* support parsing constructors.
  - We now handle virtual and explicit function specifiers.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58499 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 1cff55e..2a49e71 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -773,7 +773,8 @@
   //===--------------------------------------------------------------------===//
   // C++ Classes
   //
-
+  virtual bool isCurrentClassName(const IdentifierInfo &II, Scope *S);
+  
   virtual void ActOnStartCXXClassDef(Scope *S, DeclTy *TagDecl,
                                      SourceLocation LBrace);
 
@@ -788,6 +789,8 @@
 
   virtual void ActOnFinishCXXClassDef(DeclTy *TagDecl);
   
+  virtual DeclTy *ActOnConstructorDeclarator(CXXConstructorDecl *ConDecl);
+
   //===--------------------------------------------------------------------===//
   // C++ Derived Classes
   //