In class Function replace current code field with current instruction field, that way we save one l…

runtime/vm/stub_code_x64.cc

Index: runtime/vm/stub_code_x64.cc
===================================================================
--- runtime/vm/stub_code_x64.cc	(revision 36916)
+++ runtime/vm/stub_code_x64.cc	(working copy)
@@ -548,8 +548,7 @@
   __ popq(RBX);  // Restore IC data.
   __ LeaveStubFrame();
 
-  __ movq(RCX, FieldAddress(RAX, Function::code_offset()));
-  __ movq(RCX, FieldAddress(RCX, Code::instructions_offset()));
+  __ movq(RCX, FieldAddress(RAX, Function::instructions_offset()));
   __ addq(RCX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(RCX);
 }
@@ -1341,8 +1340,7 @@
   __ Bind(&call_target_function);
   // RAX: Target function.
   Label is_compiled;
-  __ movq(RCX, FieldAddress(RAX, Function::code_offset()));
-  __ movq(RCX, FieldAddress(RCX, Code::instructions_offset()));
+  __ movq(RCX, FieldAddress(RAX, Function::instructions_offset()));
   __ addq(RCX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(RCX);
 
@@ -1488,9 +1486,8 @@
 
   // Get function and call it, if possible.
   __ movq(RAX, Address(R12, target_offset));
-  __ movq(RCX, FieldAddress(RAX, Function::code_offset()));
-  // RCX: Target code.
-  __ movq(RCX, FieldAddress(RCX, Code::instructions_offset()));
+  __ movq(RCX, FieldAddress(RAX, Function::instructions_offset()));
+  // RCX: Target instructions.
   __ addq(RCX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(RCX);
 }
@@ -1518,8 +1515,7 @@
   __ popq(R10);  // Restore arguments descriptor array.
   __ LeaveStubFrame();
 
-  __ movq(RAX, FieldAddress(RAX, Function::code_offset()));
-  __ movq(RAX, FieldAddress(RAX, Code::instructions_offset()));
+  __ movq(RAX, FieldAddress(RAX, Function::instructions_offset()));
   __ addq(RAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(RAX);
 }