Cache optimized code on shared function info.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 946022adb402716e3568b2e13569bf72b3610778..e1958099e34afb8d3b9ad2637a8960209cf018c6 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -766,6 +766,15 @@ static inline Operand FieldOperand(Register object,
 }
 
 
+// Return a position of the element at |index_as_smi| + |additional_offset|
+// in FixedArray pointer to which is held in |array|.  |index_as_smi| is Smi.
+static inline Operand FixedArrayElementOperand(Register array,
+                                               Register index_as_smi,
+                                               int additional_offset = 0) {
+  int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize;
+  return FieldOperand(array, index_as_smi, times_half_pointer_size, offset);
+}
+
 static inline Operand ContextOperand(Register context, int index) {
   return Operand(context, Context::SlotOffset(index));
 }