Bug 253573

These failures where introduced by 260692@main:

test/built-ins/RegExp/lookBehind/mutual-recursive.js:
  default: 'Test262Error: Expected [a, aa] and [x, aa] to have the same contents. #4'
  strict mode: 'Test262Error: Expected [a, aa] and [x, aa] to have the same contents. #4'
test/built-ins/RegExp/named-groups/non-unicode-references.js:
  default: "Test262Error: Second argument shouldn't be nullish. "
  strict mode: "Test262Error: Second argument shouldn't be nullish. "
test/built-ins/RegExp/named-groups/unicode-references.js:
  default: "Test262Error: Second argument shouldn't be nullish. "
  strict mode: "Test262Error: Second argument shouldn't be nullish. "
test/built-ins/RegExp/prototype/exec/duplicate-named-groups-properties.js:
  default: 'Bad exit code: 5'
  strict mode: 'Bad exit code: 5'
test/built-ins/RegExp/prototype/exec/duplicate-named-indices-groups-properties.js:
  default: 'Bad exit code: 5'
  strict mode: 'Bad exit code: 5'
test/built-ins/String/prototype/match/duplicate-named-groups-properties.js:
  default: 'Bad exit code: 5'
  strict mode: 'Bad exit code: 5'
test/built-ins/String/prototype/match/duplicate-named-indices-groups-properties.js:
  default: 'Bad exit code: 5'
  strict mode: 'Bad exit code: 5'