Fix implementation of bit count functions.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 8a44ce1677268ef549c564cfbdffeed0a86c3da4..f114ba3f229e471809db91f7e90aaa2d780e9c00 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -5,6 +5,7 @@
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
+#include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/cpu-profiler.h"
@@ -1926,7 +1927,7 @@ static void DiscoverGreyObjectsOnPage(MarkingDeque* marking_deque,
 
     int offset = 0;
     while (grey_objects != 0) {
-      int trailing_zeros = CompilerIntrinsics::CountTrailingZeros(grey_objects);
+      int trailing_zeros = base::bits::CountTrailingZeros32(grey_objects);
       grey_objects >>= trailing_zeros;
       offset += trailing_zeros;
       MarkBit markbit(cell, 1 << offset, false);
@@ -1965,7 +1966,7 @@ int MarkCompactCollector::DiscoverAndEvacuateBlackObjectsOnPage(
 
     int offset = 0;
     while (current_cell != 0) {
-      int trailing_zeros = CompilerIntrinsics::CountTrailingZeros(current_cell);
+      int trailing_zeros = base::bits::CountTrailingZeros32(current_cell);
       current_cell >>= trailing_zeros;
       offset += trailing_zeros;
       Address address = cell_base + offset * kPointerSize;