[heap] Add atomics to mark bit operations.

test/unittests/heap/marking-unittest.cc

Index: test/unittests/heap/marking-unittest.cc
diff --git a/test/unittests/heap/marking-unittest.cc b/test/unittests/heap/marking-unittest.cc
index 28e58ca48772c5724511e694e97f7da5efbe1409..f49ae13678e3952e88d45162413b4bebbdf2b362 100644
--- a/test/unittests/heap/marking-unittest.cc
+++ b/test/unittests/heap/marking-unittest.cc
@@ -22,7 +22,7 @@ TEST(Marking, TransitionWhiteBlackWhite) {
     MarkBit mark_bit = bitmap->MarkBitFromIndex(position[i]);
     CHECK(Marking::IsWhite(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
-    Marking::WhiteToBlack(mark_bit);
+    Marking::WhiteToBlack<MarkBit::NON_ATOMIC>(mark_bit);
     CHECK(Marking::IsBlack(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
     Marking::MarkWhite(mark_bit);
@@ -43,11 +43,11 @@ TEST(Marking, TransitionWhiteGreyBlackGrey) {
     CHECK(Marking::IsWhite(mark_bit));
     CHECK(!Marking::IsBlackOrGrey(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
-    Marking::WhiteToGrey(mark_bit);
+    Marking::WhiteToGrey<MarkBit::NON_ATOMIC>(mark_bit);
     CHECK(Marking::IsGrey(mark_bit));
     CHECK(Marking::IsBlackOrGrey(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
-    Marking::GreyToBlack(mark_bit);
+    Marking::GreyToBlack<MarkBit::NON_ATOMIC>(mark_bit);
     CHECK(Marking::IsBlack(mark_bit));
     CHECK(Marking::IsBlackOrGrey(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));