Fix problems with sandboxing and the ARM integrated assembler.

src/DartARM32/assembler_arm.cc

Index: src/DartARM32/assembler_arm.cc
diff --git a/src/DartARM32/assembler_arm.cc b/src/DartARM32/assembler_arm.cc
index 37291e2fb62e05eb145c559e7f2372a51dcbb3d8..4ca0fbaa3db9954ec4c44455a88c4402d447e8cb 100644
--- a/src/DartARM32/assembler_arm.cc
+++ b/src/DartARM32/assembler_arm.cc
@@ -602,13 +602,15 @@ void Assembler::clrex() {
   Emit(encoding);
 }
 
-
+#if 0
+// Moved to ARM32::AssemblerARM32::nop().
 void Assembler::nop(Condition cond) {
   ASSERT(cond != kNoCondition);
   int32_t encoding = (static_cast<int32_t>(cond) << kConditionShift) |
                      B25 | B24 | B21 | (0xf << 12);
   Emit(encoding);
 }
+#endif
 
 
 void Assembler::vmovsr(SRegister sn, Register rt, Condition cond) {