Improve compatibility for engines without support for Annex B

test/annexB/RegExp-control-escape-russian-letter.js

test/annexB/RegExp-decimal-escape-class-range.js

test/annexB/RegExp-decimal-escape-not-capturing.js

test/annexB/RegExp-leading-escape-BMP.js

test/annexB/RegExp-leading-escape.js

test/annexB/RegExp-trailing-escape-BMP.js

test/annexB/RegExp-trailing-escape.js

test/annexB/catch-redeclared-var-statement-captured.js

test/annexB/catch-redeclared-var-statement.js

test/built-ins/Function/15.3.5.4_2-12gs.js

test/built-ins/Function/15.3.5.4_2-14gs.js

test/built-ins/Function/15.3.5.4_2-75gs.js

test/built-ins/Function/15.3.5.4_2-76gs.js

test/built-ins/Function/15.3.5.4_2-77gs.js

test/built-ins/Function/15.3.5.4_2-78gs.js

test/built-ins/Function/15.3.5.4_2-79gs.js

test/built-ins/Function/15.3.5.4_2-80gs.js

test/built-ins/Function/15.3.5.4_2-81gs.js

test/built-ins/Function/15.3.5.4_2-82gs.js

test/built-ins/Function/15.3.5.4_2-83gs.js