Use StackArgumentsAccessor to access receiver on stack, use kPCOnStackSize to

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index 9692ec02f9887fe70e898f36bdbf0564388d5d3f..ef513d1e534801382c0f385a3930e7f3597e93ed 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -395,7 +395,7 @@ enum ScaleFactor {
   times_4 = 2,
   times_8 = 3,
   times_int_size = times_4,
-  times_pointer_size = times_8
+  times_pointer_size = (kPointerSize == 8) ? times_8 : times_4
 };
 
 
@@ -1021,7 +1021,6 @@ class Assembler : public AssemblerBase {
     immediate_arithmetic_op_32(0x1, dst, src);
   }
 
-
   void rcl(Register dst, Immediate imm8) {
     shift(dst, imm8, 0x2);
   }