First step to cleanup the power-of-2 mess.

src/arm/assembler-arm.cc

Index: src/arm/assembler-arm.cc
diff --git a/src/arm/assembler-arm.cc b/src/arm/assembler-arm.cc
index e7b81cbb171aa5a1d18484e4e45f616aedff99d7..96f28f968391a8021e4e5b2b69a78ba0c9cf50c7 100644
--- a/src/arm/assembler-arm.cc
+++ b/src/arm/assembler-arm.cc
@@ -39,6 +39,7 @@
 #if V8_TARGET_ARCH_ARM
 
 #include "src/arm/assembler-arm-inl.h"
+#include "src/base/bits.h"
 #include "src/base/cpu.h"
 #include "src/macro-assembler.h"
 #include "src/serialize.h"
@@ -498,7 +499,7 @@ void Assembler::GetCode(CodeDesc* desc) {
 
 
 void Assembler::Align(int m) {
-  DCHECK(m >= 4 && IsPowerOf2(m));
+  DCHECK(m >= 4 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     nop();
   }