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

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 8cdf6b995beeb0d55d70e113a846e12bccf93dfa..31355b686539571edf40ee478c0413ff93fd6a67 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -6,6 +6,7 @@
 
 #if V8_TARGET_ARCH_ARM
 
+#include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ -2953,7 +2954,7 @@ void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
   // Fast case of Heap::LookupSingleCharacterStringFromCode.
   STATIC_ASSERT(kSmiTag == 0);
   STATIC_ASSERT(kSmiShiftSize == 0);
-  DCHECK(IsPowerOf2(String::kMaxOneByteCharCode + 1));
+  DCHECK(base::bits::IsPowerOfTwo32(String::kMaxOneByteCharCode + 1));
   __ tst(code_,
          Operand(kSmiTagMask |
                  ((~String::kMaxOneByteCharCode) << kSmiTagSize)));
@@ -4393,7 +4394,7 @@ void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
   int frame_alignment = masm->ActivationFrameAlignment();
   if (frame_alignment > kPointerSize) {
     __ mov(r5, sp);
-    DCHECK(IsPowerOf2(frame_alignment));
+    DCHECK(base::bits::IsPowerOfTwo32(frame_alignment));
     __ and_(sp, sp, Operand(-frame_alignment));
   }