Merge pull request #2056 from anba/test-bugs-jan2019

...alid-private-names/default/cls-decl-inner-method.template

...alid-private-names/default/cls-expr-inner-method.template

...valid-names/method-inner-call-expression-bad-reference.js

...errors/invalid-names/method-inner-call-expression-this.js

...lid-names/method-inner-member-expression-bad-reference.js

...rors/invalid-names/method-inner-member-expression-this.js

...guage/expressions/postfix-decrement/arguments-nostrict.js

...guage/expressions/postfix-increment/arguments-nostrict.js

...nguage/expressions/prefix-decrement/arguments-nostrict.js

...nguage/expressions/prefix-increment/arguments-nostrict.js

...valid-names/method-inner-call-expression-bad-reference.js

...errors/invalid-names/method-inner-call-expression-this.js

...lid-names/method-inner-member-expression-bad-reference.js

...rors/invalid-names/method-inner-member-expression-this.js