ARM: Optimize stubs for incremental marking.

src/arm/full-codegen-arm.cc

 // Copyright 2011 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 3201 matching lines @@
 
   // Swap elements.
   __ ldr(scratch1, MemOperand(index1, 0));
   __ ldr(scratch2, MemOperand(index2, 0));
   __ str(scratch1, MemOperand(index2, 0));
   __ str(scratch2, MemOperand(index1, 0));
 
   Label no_remembered_set;
   __ CheckPageFlag(elements,
                    scratch1,
-                   MemoryChunk::SCAN_ON_SCAVENGE,
+                   1 << MemoryChunk::SCAN_ON_SCAVENGE,
                    ne,
                    &no_remembered_set);
   // Possible optimization: do a check that both values are Smis
   // (or them and test against Smi mask.)
 
   // We are swapping two objects in an array and the incremental marker never
   // pauses in the middle of scanning a single object.  Therefore the
   // incremental marker is not disturbed, so we don't need to call the
   // RecordWrite stub that notifies the incremental marker.
   __ RememberedSetHelper(
@@ skipping 1083 matching lines @@
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM