Follow-up fix to my change to IsPowerOfTwo: Alignment of one means no alignment, not zero.

runtime/vm/simulator_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <math.h>  // for isnan.
 #include <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
@@ skipping 2096 matching lines @@
   } else {
     set_register(A0, parameter0);
     set_register(A1, parameter1);
     set_register(A2, parameter2);
     set_register(A3, parameter3);
   }
 
   // Make sure the activation frames are properly aligned.
   int32_t stack_pointer = sp_before_call;
   static const int kFrameAlignment = OS::ActivationFrameAlignment();
-  if (kFrameAlignment > 0) {
+  if (kFrameAlignment > 1) {
     stack_pointer = Utils::RoundDown(stack_pointer, kFrameAlignment);
   }
   set_register(SP, stack_pointer);
 
   // Prepare to execute the code at entry.
   set_pc(entry);
   // Put down marker for end of simulation. The simulator will stop simulation
   // when the PC reaches this value. By saving the "end simulation" value into
   // RA the simulation stops when returning to this call point.
   set_register(RA, kEndSimulatingPC);
@@ skipping 117 matching lines @@
   set_register(kExceptionObjectReg, bit_cast<int32_t>(raw_exception));
   set_register(kStackTraceObjectReg, bit_cast<int32_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_MIPS)
 
 #endif  // defined TARGET_ARCH_MIPS