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

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index 063f53b5f6bf7bf38409ec955a962c6c0c2f5046..6f52cc73b3e8d11902e131451e3fac8f5e3a72a0 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -6,6 +6,7 @@
 
 #if V8_TARGET_ARCH_ARM64
 
+#include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
 #include "src/cpu-profiler.h"
@@ -2059,7 +2060,7 @@ void MacroAssembler::CallCFunction(Register function,
     int sp_alignment = ActivationFrameAlignment();
     // The ABI mandates at least 16-byte alignment.
     DCHECK(sp_alignment >= 16);
-    DCHECK(IsPowerOf2(sp_alignment));
+    DCHECK(base::bits::IsPowerOfTwo32(sp_alignment));
 
     // The current stack pointer is a callee saved register, and is preserved
     // across the call.