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

runtime/vm/assembler_arm.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 "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
@@ skipping 2464 matching lines @@
 
 void Assembler::Ret() {
   bx(LR);
 }
 
 
 void Assembler::ReserveAlignedFrameSpace(intptr_t frame_space) {
   // Reserve space for arguments and align frame before entering
   // the C++ world.
   AddImmediate(SP, -frame_space);
-  if (OS::ActivationFrameAlignment() > 0) {
+  if (OS::ActivationFrameAlignment() > 1) {
     bic(SP, SP, ShifterOperand(OS::ActivationFrameAlignment() - 1));
   }
 }
 
 
 void Assembler::EnterCallRuntimeFrame(intptr_t frame_space) {
   // Preserve volatile CPU registers.
   EnterFrame(kDartVolatileCpuRegs | (1 << FP) | (1 << LR), 0);
 
   // Preserve all volatile FPU registers.
@@ skipping 234 matching lines @@
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfFpuRegisters));
   return fpu_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM