Fix more WebKit test expectations

test/webkit/webkit.status

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # 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
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 15 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 [
 [ALWAYS, {
   # BUG(237872). TODO(bmeurer): Investigate.
   'string-replacement-outofmemory': [FAIL],
 
   # TODO(rossberg): Awaiting spec resolution (https://bugs.ecmascript.org/show_bug.cgi?id=2566)
   'fast/js/Promise-then': [FAIL],
 
+  # TODO(rossberg): Tests use invalid LHS expressions.
+  'parser-xml-close-comment': [SKIP],
+  'toString-prefix-postfix-preserve-parens': [SKIP],
+
   ##############################################################################
   # Flaky tests.
   # BUG(v8:2989).
   'dfg-inline-arguments-become-double': [PASS, FAIL],
   'dfg-inline-arguments-become-int32': [PASS, FAIL],
   'dfg-inline-arguments-reset': [PASS, FAIL],
   'dfg-inline-arguments-reset-changetype': [PASS, FAIL],
 }],  # ALWAYS
 ['mode == debug', {
   # Too slow in debug mode.
   'dfg-int-overflow-in-loop': [SKIP],
   'dfg-double-vote-fuzz': [SKIP],
   'reentrant-caching': [SKIP],
   'sort-large-array': [SKIP],
 }],  # 'mode == debug'
 ['simulator', {
   'function-apply-aliased': [SKIP],
 }],  # 'simulator'
 ['arch == a64 and simulator_run == True', {
   'dfg-int-overflow-in-loop': [SKIP],
 }],  # 'arch == a64 and simulator_run == True'
 ]