[turbofan] Port Crankshaft's weak objects mechanism to TurboFan.

test/cctest/cctest.status

 # Copyright 2011 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
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@@ skipping 103 matching lines @@
   'test-heap-profiler/ManyLocalsInSharedContext': [PASS, NO_VARIANTS],
   'test-serialize/SerializeToplevelLargeCodeObject': [PASS, NO_VARIANTS],
   'test-debug/ThreadedDebugging': [PASS, NO_VARIANTS],
   # BUG(3742).
   'test-mark-compact/MarkCompactCollector': [PASS, ['arch==arm', NO_VARIANTS]],
 
   # TODO(mstarzinger): The rewriter is not being called when top-level code is
   # optimized and hence scripts don't "return" the correct value. Fix this.
   'test-compiler/CompileFunctionInContext*': [PASS, NO_VARIANTS],
 
+  # TODO(bmeurer): TurboFan embeds strong references to all kinds of objects
+  # via deoptimization data (Crankshaft also does this, but lack proper test
+  # coverage).
+  'test-heap/ObjectsInOptimizedCodeAreWeak': [PASS, NO_VARIANTS],
+
   # TurboFan doesn't support allocation sites currently.
-  'test-heap/CellsInOptimizedCodeAreWeak': [PASS, NO_VARIANTS],
   'test-heap/EnsureAllocationSiteDependentCodesProcessed': [PASS, NO_VARIANTS],
-  'test-heap/ObjectsInOptimizedCodeAreWeak': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringAllocationFolding': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringdoubleArrayLiterals': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringDoubleArrayProperties': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringMixedInObjectProperties': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringNestedDoubleLiterals': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringNestedMixedArrayLiterals': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringNestedObjectLiterals': [PASS, NO_VARIANTS],
   'test-heap/OptimizedPretenuringObjectArrayLiterals': [PASS, NO_VARIANTS],
 
   # TurboFan cpu profiler result is different.
@@ skipping 331 matching lines @@
 ##############################################################################
 ['arch == ppc and simulator_run == True or arch == ppc64 and simulator_run == True', {
 
   # Pass but take too long with the simulator.
   'test-api/Threading1': [PASS, SLOW],
   'test-api/Threading2': [PASS, SLOW],
   'test-api/ExternalArrays': [PASS, SLOW],
 
 }],  # 'arch == ppc64 and simulator_run == True'
 ]