Reland remaining parts of 'Use weak cells in map checks in polymorphic ICs'

test/cctest/cctest.status

Index: test/cctest/cctest.status
diff --git a/test/cctest/cctest.status b/test/cctest/cctest.status
index 82740c9a69196c8befd1a44679390d2fab37079e..374c3bc28cb5ccb46eaa02fc75e9c761888197bc 100644
--- a/test/cctest/cctest.status
+++ b/test/cctest/cctest.status
@@ -78,14 +78,6 @@
   'test-debug/RecursiveBreakpoints': [PASS, FLAKY],
   'test-debug/RecursiveBreakpointsGlobal': [PASS, FLAKY],
 
-  # BUG(3629). Known memory leak.
-  'test-heap/WeakMapInPolymorphicStoreIC': [SKIP],
-  # BUG(3663).
-  'test-heap/WeakMapInPolymorphicLoadIC': [SKIP],
-  'test-heap/WeakMapInPolymorphicKeyedLoadIC': [SKIP],
-  'test-heap/WeakMapInPolymorphicKeyedStoreIC': [SKIP],
-  'test-heap/IncrementalMarkingPreservesPolymorphicIC': [SKIP],
-
   ##############################################################################
   # TurboFan compiler failures.