[simulator] remove unused argument field for stop/breaks.

src/arm/assembler-arm.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 2264 matching lines @@
 }
 
 
 // Exception-generating instructions and debugging support.
 // Stops with a non-negative code less than kNumOfWatchedStops support
 // enabling/disabling and a counter feature. See simulator-arm.h .
 void Assembler::stop(const char* msg, Condition cond, int32_t code) {
 #ifndef __arm__
   DCHECK(code >= kDefaultStopCode);
   {
-    // The Simulator will handle the stop instruction and get the message
-    // address. It expects to find the address just after the svc instruction.
     BlockConstPoolScope block_const_pool(this);
     if (code >= 0) {
       svc(kStopCode + code, cond);
     } else {
       svc(kStopCode + kMaxStopCode, cond);
     }
-    // Do not embed the message string address! We used to do this, but that
-    // made snapshots created from position-independent executable builds
-    // non-deterministic.
-    // TODO(yangguo): remove this field entirely.
-    nop();
   }
 #else  // def __arm__
   if (cond != al) {
     Label skip;
     b(&skip, NegateCondition(cond));
     bkpt(0);
     bind(&skip);
   } else {
     bkpt(0);
   }
@@ skipping 3026 matching lines @@
     DCHECK(is_uint12(offset));
     instr_at_put(pc, SetLdrRegisterImmediateOffset(instr, offset));
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM