MIPS: A debug code assert needed to be behind the new optimize_constructed_arrays flag.

Port r13791 (fe11ffe7)

BUG=

Review URL: https://codereview.chromium.org/12512002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13837 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/builtins-mips.cc

@@ -572,17 +572,19 @@ void Builtins::Generate_ArrayConstructCode(MacroAssembler* masm) {
     __ Assert(eq, "Unexpected initial map for Array function (4)",
               t0, Operand(MAP_TYPE));
 
-    // We should either have undefined in a2 or a valid jsglobalpropertycell
-    Label okay_here;
-    Handle<Object> undefined_sentinel(
-        masm->isolate()->heap()->undefined_value(), masm->isolate());
-    Handle<Map> global_property_cell_map(
-        masm->isolate()->heap()->global_property_cell_map());
-    __ Branch(&okay_here, eq, a2, Operand(undefined_sentinel));
-    __ lw(a3, FieldMemOperand(a2, 0));
-    __ Assert(eq, "Expected property cell in register a3",
-              a3, Operand(global_property_cell_map));
-    __ bind(&okay_here);
+    if (FLAG_optimize_constructed_arrays) {
+      // We should either have undefined in a2 or a valid jsglobalpropertycell
+      Label okay_here;
+      Handle<Object> undefined_sentinel(
+          masm->isolate()->heap()->undefined_value(), masm->isolate());
+      Handle<Map> global_property_cell_map(
+          masm->isolate()->heap()->global_property_cell_map());
+      __ Branch(&okay_here, eq, a2, Operand(undefined_sentinel));
+      __ lw(a3, FieldMemOperand(a2, 0));
+      __ Assert(eq, "Expected property cell in register a3",
+                a3, Operand(global_property_cell_map));
+      __ bind(&okay_here);
+    }
   }
 
   if (FLAG_optimize_constructed_arrays) {