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

runtime/vm/assembler_mips.cc

Index: runtime/vm/assembler_mips.cc
===================================================================
--- runtime/vm/assembler_mips.cc	(revision 27015)
+++ runtime/vm/assembler_mips.cc	(working copy)
@@ -830,7 +830,7 @@
   // Reserve space for arguments and align frame before entering
   // the C++ world.
   AddImmediate(SP, -frame_space);
-  if (OS::ActivationFrameAlignment() > 0) {
+  if (OS::ActivationFrameAlignment() > 1) {
     LoadImmediate(TMP1, ~(OS::ActivationFrameAlignment() - 1));
     and_(SP, SP, TMP1);
   }