[date] Add ICU backend for timezone info behind a flag

test/mjsunit/mjsunit.status

 # Copyright 2012 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 520 matching lines @@
 ##############################################################################
 ['system == windows', {
   # TODO(mstarzinger): Too slow with turbo fan.
   'big-object-literal': [SKIP],
   'math-floor-of-div': [PASS, ['mode == debug', SKIP]],
   'math-floor-of-div-nosudiv': [PASS, ['mode == debug', SKIP]],
   'unicodelctest': [PASS, ['mode == debug', SKIP]],
 
   # BUG(v8:4495).
   'es6/collections': [PASS, ['arch == ia32', FAST_VARIANTS]],
+
+  # Setting the timezone and locale with environment variables unavailable
+  'icu-date-to-string': [SKIP],
+  'icu-date-lord-howe': [SKIP],
 }],  # 'system == windows'
 
 ##############################################################################
 ['system == macos', {
   # BUG(v8:5333)
   'big-object-literal': [SKIP],
 }],  # 'system == macos'
 
 ##############################################################################
 ['deopt_fuzzer == True', {
@@ skipping 122 matching lines @@
   'lithium/*': [SKIP],
   'third_party/*': [SKIP],
   'tools/*': [SKIP],
   'apply': [SKIP],
   'math-*': [SKIP],
   'unicode-test': [SKIP],
   'whitespaces': [SKIP],
 }],  # variant == wasm_traps
 
 ]