HSubAllocatedObject instruction allows hydrogen code to carve up

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 81976a6b53f9d14cb081bf16d86545a3e9495d45..282e1880303280c2b08f0f8c4fbbaee78cfdd09c 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -3948,6 +3948,13 @@ void LCodeGen::DoCallRuntime(LCallRuntime* instr) {
 }
 
 
+void LCodeGen::DoInnerAllocatedObject(LInnerAllocatedObject* instr) {
+  Register result = ToRegister(instr->result());
+  Register base = ToRegister(instr->base_object());
+  __ lea(result, Operand(base, instr->offset()));
+}
+
+
 void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
   Register object = ToRegister(instr->object());
   Register value = ToRegister(instr->value());