Turn FastNewContextStub into a HydrogenCodeStub.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 5cc02e4d7eb5a10d3becea138da155bac6b3ae92..12742fbea1a3ea5c962bace28702338797d0b2a8 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -49,6 +49,16 @@ void FastNewClosureStub::InitializeInterfaceDescriptor(
 }
 
 
+void FastNewContextStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { r1 };
+  descriptor->register_param_count_ = 1;
+  descriptor->register_params_ = registers;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
 void ToNumberStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
@@ -461,48 +471,6 @@ void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm) {
 }
 
 
-void FastNewContextStub::Generate(MacroAssembler* masm) {
-  // Try to allocate the context in new space.
-  Label gc;
-  int length = slots_ + Context::MIN_CONTEXT_SLOTS;
-
-  // Attempt to allocate the context in new space.
-  __ Allocate(FixedArray::SizeFor(length), r0, r1, r2, &gc, TAG_OBJECT);
-
-  // Load the function from the stack.
-  __ ldr(r3, MemOperand(sp, 0));
-
-  // Set up the object header.
-  __ LoadRoot(r1, Heap::kFunctionContextMapRootIndex);
-  __ mov(r2, Operand(Smi::FromInt(length)));
-  __ str(r2, FieldMemOperand(r0, FixedArray::kLengthOffset));
-  __ str(r1, FieldMemOperand(r0, HeapObject::kMapOffset));
-
-  // Set up the fixed slots, copy the global object from the previous context.
-  __ ldr(r2, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  __ mov(r1, Operand(Smi::FromInt(0)));
-  __ str(r3, MemOperand(r0, Context::SlotOffset(Context::CLOSURE_INDEX)));
-  __ str(cp, MemOperand(r0, Context::SlotOffset(Context::PREVIOUS_INDEX)));
-  __ str(r1, MemOperand(r0, Context::SlotOffset(Context::EXTENSION_INDEX)));
-  __ str(r2, MemOperand(r0, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-
-  // Initialize the rest of the slots to undefined.
-  __ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
-  for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
-    __ str(r1, MemOperand(r0, Context::SlotOffset(i)));
-  }
-
-  // Remove the on-stack argument and return.
-  __ mov(cp, r0);
-  __ pop();
-  __ Ret();
-
-  // Need to collect. Call into runtime system.
-  __ bind(&gc);
-  __ TailCallRuntime(Runtime::kNewFunctionContext, 1, 1);
-}
-
-
 void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   // Stack layout on entry:
   //