[debugger] fix break locations for assignments and return.

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 484 matching lines @@
   # 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'
 
 ##############################################################################
 ['ignition == True', {
   # TODO(yangguo,4690): Test failures in debugger tests.
-  'test-debug/DebugStepLocals': [FAIL],
   'test-debug/DebugStepKeyedLoadLoop': [FAIL],
   'test-debug/DebugStepKeyedStoreLoop': [FAIL],
   'test-debug/DebugStepIf': [FAIL],
   'test-debug/DebugStepNamedLoadLoop': [FAIL],
-  'test-debug/DebugStepDeclarations': [FAIL],
   'test-debug/BreakPointConstructCallWithGC': [PASS, FAIL],
   'test-debug/DebugStepNamedStoreLoop': [FAIL],
-  'test-debug/DebugStepLinearMixedICs': [FAIL],
   'test-debug/DebugStepSwitch': [FAIL],
   'test-debug/DebugStepWhile': [FAIL],
   'test-debug/DebugStepFor': [FAIL],
   'test-debug/DebugStepForContinue': [FAIL],
   'test-debug/DebugStepForIn': [FAIL],
   'test-debug/DebugStepDoWhile': [FAIL],
   'test-debug/DebugConditional': [FAIL],
   'test-debug/DebugStepForBreak': [FAIL],
   'test-debug/DebugStepWith': [FAIL],
   'test-debug/DebugStepFunctionApply': [FAIL],
@@ skipping 39 matching lines @@
   'test-heap/IncrementalMarkingClearsMonomorphicConstructor': [FAIL],
   'test-heap/IncrementalMarkingPreservesMonomorphicConstructor': [FAIL],
   'test-heap/IncrementalMarkingPreservesMonomorphicCallIC': [FAIL],
   'test-heap/CompilationCacheCachingBehavior': [FAIL],
   'test-heap/CellsInOptimizedCodeAreWeak': [FAIL],
   'test-run-inlining/InlineTwice': [FAIL],
   'test-serialize/SerializeInternalReference': [FAIL, ['arch == arm or arch == arm64', PASS]],
 }],  # ignition == True
 
 ]