Reland arguments access support for inlined functions (r11109,r11118).

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 56ba6f34585179df27e6b419809857e74b2b1981..9498f3967d1feb6a6b43cbce5a11c7556e8cc5ff 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2497,24 +2497,28 @@ void LCodeGen::DoLoadKeyedGeneric(LLoadKeyedGeneric* instr) {
 void LCodeGen::DoArgumentsElements(LArgumentsElements* instr) {
   Register result = ToRegister(instr->result());
 
-  // Check for arguments adapter frame.
-  Label done, adapted;
-  __ movq(result, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
-  __ Cmp(Operand(result, StandardFrameConstants::kContextOffset),
-         Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
-  __ j(equal, &adapted, Label::kNear);
-
-  // No arguments adaptor frame.
-  __ movq(result, rbp);
-  __ jmp(&done, Label::kNear);
+  if (instr->from_inlined()) {
+    __ lea(result, Operand(rsp, -2 * kPointerSize));
+  } else {
+    // Check for arguments adapter frame.
+    Label done, adapted;
+    __ movq(result, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
+    __ Cmp(Operand(result, StandardFrameConstants::kContextOffset),
+           Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
+    __ j(equal, &adapted, Label::kNear);
+
+    // No arguments adaptor frame.
+    __ movq(result, rbp);
+    __ jmp(&done, Label::kNear);
 
-  // Arguments adaptor frame present.
-  __ bind(&adapted);
-  __ movq(result, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
+    // Arguments adaptor frame present.
+    __ bind(&adapted);
+    __ movq(result, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
 
-  // Result is the frame pointer for the frame if not adapted and for the real
-  // frame below the adaptor frame if adapted.
-  __ bind(&done);
+    // Result is the frame pointer for the frame if not adapted and for the real
+    // frame below the adaptor frame if adapted.
+    __ bind(&done);
+  }
 }
 
 
@@ -2640,6 +2644,11 @@ void LCodeGen::DoPushArgument(LPushArgument* instr) {
 }
 
 
+void LCodeGen::DoDrop(LDrop* instr) {
+  __ Drop(instr->count());
+}
+
+
 void LCodeGen::DoThisFunction(LThisFunction* instr) {
   Register result = ToRegister(instr->result());
   __ LoadHeapObject(result, instr->hydrogen()->closure());