Use cmp instead of tst to check for zero.

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 1802 matching lines @@
       __ sub(scratch1, left, Operand(right), SetCC);
       __ b(vs, &stub_call);
       __ mov(right, scratch1);
       break;
     case Token::MUL: {
       __ SmiUntag(ip, right);
       __ smull(scratch1, scratch2, left, ip);
       __ mov(ip, Operand(scratch1, ASR, 31));
       __ cmp(ip, Operand(scratch2));
       __ b(ne, &stub_call);
-      __ tst(scratch1, Operand(scratch1));
+      __ cmp(scratch1, Operand(0));
       __ mov(right, Operand(scratch1), LeaveCC, ne);
       __ b(ne, &done);
       __ add(scratch2, right, Operand(left), SetCC);
       __ mov(right, Operand(Smi::FromInt(0)), LeaveCC, pl);
       __ b(mi, &stub_call);
       break;
     }
     case Token::BIT_OR:
       __ orr(right, left, Operand(right));
       break;
@@ skipping 2556 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM