Add map-based read barrier to WeakCell

test/cctest/test-compiler.cc

Index: test/cctest/test-compiler.cc
diff --git a/test/cctest/test-compiler.cc b/test/cctest/test-compiler.cc
index e47b1d61bd9228b86c45098d6867b8a8f9de1e3c..002ed9ca6e89ab09d6f23de58457f65c338e5351 100644
--- a/test/cctest/test-compiler.cc
+++ b/test/cctest/test-compiler.cc
@@ -316,7 +316,7 @@ TEST(FeedbackVectorPreservedAcrossRecompiles) {
   FeedbackVectorICSlot slot_for_a(0);
   Object* object = feedback_vector->Get(slot_for_a);
   CHECK(object->IsWeakCell() &&
-        WeakCell::cast(object)->value()->IsJSFunction());
+        WeakCell::cast(object)->ValueNoReadBarrier()->IsJSFunction());
 
   CompileRun("%OptimizeFunctionOnNextCall(f); f(fun1);");
 
@@ -326,7 +326,7 @@ TEST(FeedbackVectorPreservedAcrossRecompiles) {
   CHECK(f->shared()->has_deoptimization_support());
   object = f->shared()->feedback_vector()->Get(slot_for_a);
   CHECK(object->IsWeakCell() &&
-        WeakCell::cast(object)->value()->IsJSFunction());
+        WeakCell::cast(object)->ValueNoReadBarrier()->IsJSFunction());
 }