Inline simple setter calls.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 278a298435e56de0d7b0440d5d9e60e21f731349..4ea3777b40e9003be449839d2102849a1a92008a 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -135,9 +135,7 @@ class HBasicBlock: public ZoneObject {
 
   // Add the inlined function exit sequence, adding an HLeaveInlined
   // instruction and updating the bailout environment.
-  void AddLeaveInlined(HValue* return_value,
-                       HBasicBlock* target,
-                       FunctionState* state = NULL);
+  void AddLeaveInlined(HValue* return_value, FunctionState* state);
 
   // If a target block is tagged as an inline function return, all
   // predecessors should contain the inlined exit sequence:
@@ -510,7 +508,7 @@ class HEnvironment: public ZoneObject {
                                 FunctionLiteral* function,
                                 HConstant* undefined,
                                 CallKind call_kind,
-                                bool is_construct) const;
+                                ReturnHandlingFlag return_handling) const;
 
   void AddIncomingEdge(HBasicBlock* block, HEnvironment* other);
 
@@ -703,13 +701,6 @@ class TestContext: public AstContext {
 };
 
 
-enum ReturnHandlingFlag {
-  NORMAL_RETURN,
-  DROP_EXTRA_ON_RETURN,
-  CONSTRUCT_CALL_RETURN
-};
-
-
 class FunctionState {
  public:
   FunctionState(HGraphBuilder* owner,
@@ -721,8 +712,7 @@ class FunctionState {
   CompilationInfo* compilation_info() { return compilation_info_; }
   TypeFeedbackOracle* oracle() { return oracle_; }
   AstContext* call_context() { return call_context_; }
-  bool drop_extra() { return return_handling_ == DROP_EXTRA_ON_RETURN; }
-  bool is_construct() { return return_handling_ == CONSTRUCT_CALL_RETURN; }
+  ReturnHandlingFlag return_handling() const { return return_handling_; }
   HBasicBlock* function_return() { return function_return_; }
   TestContext* test_context() { return test_context_; }
   void ClearInlinedTestContext() {
@@ -752,10 +742,6 @@ class FunctionState {
   // inlined. NULL when not inlining.
   AstContext* call_context_;
 
-  // Indicate whether we have to perform special handling on return from
-  // inlined functions.
-  // - DROP_EXTRA_ON_RETURN: Drop an extra value from the environment.
-  // - CONSTRUCT_CALL_RETURN: Either use allocated receiver or return value.
   ReturnHandlingFlag return_handling_;
 
   // When inlining in an effect or value context, this is the return block.
@@ -1033,7 +1019,7 @@ class HGraphBuilder: public AstVisitor {
   bool TryInline(CallKind call_kind,
                  Handle<JSFunction> target,
                  int arguments_count,
-                 HValue* receiver,
+                 HValue* implicit_return_value,
                  BailoutId ast_id,
                  BailoutId return_id,
                  ReturnHandlingFlag return_handling);
@@ -1041,6 +1027,9 @@ class HGraphBuilder: public AstVisitor {
   bool TryInlineCall(Call* expr, bool drop_extra = false);
   bool TryInlineConstruct(CallNew* expr, HValue* receiver);
   bool TryInlineGetter(Handle<JSFunction> getter, Property* prop);
+  bool TryInlineSetter(Handle<JSFunction> setter,
+                       Assignment* assignment,
+                       HValue* implicit_return_value);
   bool TryInlineBuiltinMethodCall(Call* expr,
                                   HValue* receiver,
                                   Handle<Map> receiver_map,