Fix implementation of bit count functions.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 896efcf65f68c1d75ec5a19c9c6823d1541daf69..6eb7306347e96001e05a304e24eec403b7aedeae 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -4,6 +4,7 @@
 
 #include "src/v8.h"
 
+#include "src/base/bits.h"
 #include "src/double.h"
 #include "src/factory.h"
 #include "src/hydrogen-infer-representation.h"
@@ -4179,8 +4180,7 @@ HInstruction* HUnaryMathOperation::New(
         return H_CONSTANT_DOUBLE(Floor(d));
       case kMathClz32: {
         uint32_t i = DoubleToUint32(d);
-        return H_CONSTANT_INT(
-            (i == 0) ? 32 : CompilerIntrinsics::CountLeadingZeros(i));
+        return H_CONSTANT_INT(base::bits::CountLeadingZeros32(i));
       }
       default:
         UNREACHABLE();