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

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 18dc9e1dddb7815cf0ca12a87453ff7ae4fb48de..16169b435ef14d82603d05a4c0f6930a519277eb 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -6,6 +6,7 @@
 
 #if V8_TARGET_ARCH_IA32
 
+#include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ -2833,7 +2834,7 @@ 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));
   __ test(code_,
           Immediate(kSmiTagMask |
                     ((~String::kMaxOneByteCharCode) << kSmiTagSize)));