[regexp] Update lastIndex semantics in RegExpBuiltinExec

test/test262/test262.status

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@@ skipping 73 matching lines @@
   'language/statements/variable/binding-resolution': [FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=4253
   'language/asi/S7.9_A5.7_T1': [PASS, FAIL_OK],
 
   ###### BEGIN REGEXP SUBCLASSING SECTION ######
   # https://bugs.chromium.org/p/v8/issues/detail?id=5361
   'built-ins/RegExp/prototype/Symbol.replace/y-init-lastindex': [FAIL],
   'built-ins/RegExp/prototype/Symbol.replace/y-set-lastindex': [FAIL],
 
+  # https://bugs.chromium.org/p/v8/issues/detail?id=5949
+  'built-ins/RegExp/prototype/exec/failure-lastindex-no-access': [FAIL],
+  'built-ins/RegExp/prototype/exec/success-lastindex-no-access': [FAIL],
+
   ###### END REGEXP SUBCLASSING SECTION ######
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=4895
   'built-ins/TypedArrays/internals/DefineOwnProperty/detached-buffer': [FAIL],
   'built-ins/TypedArrays/internals/DefineOwnProperty/detached-buffer-realm': [FAIL],
   'built-ins/TypedArrays/internals/Get/detached-buffer': [FAIL],
   'built-ins/TypedArrays/internals/Get/detached-buffer-realm': [FAIL],
   'built-ins/TypedArrays/internals/GetOwnProperty/detached-buffer': [FAIL],
   'built-ins/TypedArrays/internals/GetOwnProperty/detached-buffer-realm': [FAIL],
   'built-ins/TypedArrays/internals/HasProperty/detached-buffer': [FAIL],
@@ skipping 510 matching lines @@
 
 ['variant == asm_wasm', {
   '*': [SKIP],
 }],  # variant == asm_wasm
 
 ['variant == wasm_traps', {
   '*': [SKIP],
 }],  # variant == wasm_traps
 
 ]