* Make stack/preemption guard faster on ARM by putting stack...

src/arm/virtual-frame-arm.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 84 matching lines @@
   UNREACHABLE();
 }
 
 
 void VirtualFrame::Enter() {
   Comment cmnt(masm(), "[ Enter JS frame");
 
 #ifdef DEBUG
   // Verify that r1 contains a JS function.  The following code relies
   // on r2 being available for use.
-  { Label map_check, done;
+  if (FLAG_debug_code) {
+    Label map_check, done;
     __ tst(r1, Operand(kSmiTagMask));
     __ b(ne, &map_check);
     __ stop("VirtualFrame::Enter - r1 is not a function (smi check).");
     __ bind(&map_check);
     __ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
     __ b(eq, &done);
     __ stop("VirtualFrame::Enter - r1 is not a function (map check).");
     __ bind(&done);
   }
 #endif  // DEBUG
@@ skipping 250 matching lines @@
   ASSERT(stack_pointer_ == element_count() - 1);
   elements_.Add(FrameElement::MemoryElement());
   stack_pointer_++;
   __ push(reg);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal