implement codegen support for return of void and simple scalars.

llvm-svn: 39547
diff --git a/clang/CodeGen/CodeGenFunction.h b/clang/CodeGen/CodeGenFunction.h
index 6e042d9..fb7e72a 100644
--- a/clang/CodeGen/CodeGenFunction.h
+++ b/clang/CodeGen/CodeGenFunction.h
@@ -30,6 +30,7 @@
   class LabelStmt;
   class GotoStmt;
   class IfStmt;
+  class ReturnStmt;
   
   class Expr;
   class IntegerLiteral;
@@ -80,6 +81,8 @@
   CodeGenModule &CGM;  // Per-module state.
   TargetInfo &Target;
   LLVMBuilder Builder;
+  
+  const FunctionDecl *CurFuncDecl;
   llvm::Function *CurFn;
 
   /// LabelMap - This keeps track of the LLVM basic block for each C label.
@@ -108,6 +111,7 @@
   void EmitLabelStmt(const LabelStmt &S);
   void EmitGotoStmt(const GotoStmt &S);
   void EmitIfStmt(const IfStmt &S);
+  void EmitReturnStmt(const ReturnStmt &S);
   
   //===--------------------------------------------------------------------===//
   //                             Expression Emission