Closes #1634.

Class Fields: convert propname-error into non-generated to avoid creating erroneous tests where restrictions do not align.

Early errors may result from parsing the source text of a test file, but
they may also result from parsing some other source text as referenced
through the ES2015 module syntax. The latter form of early error is not
necessarily detectable by ECMAScript parsers, however. Because of this,
the label "early" is not sufficiently precise for all Test262 consumers
to correctly interpret all tests.

Update the "phase" name of "early" to "parse" for all those negative
tests that describe errors resulting from parsing of the file's source
text directly. A forthcoming commit will update the remaining tests to
use a "phase" name that is more specific to module resolution.

* Accessing `ta[0]` throws a TypeError.

* Fix array indices starting at 0 and property references

* Fix classfields templates for properly checking static propnames.

* Generate tests

* `assert.equal` is not defined

* Add missing includes

* Generate tests

* typo s/Avalue/42/

* fix whitespace

* Add missing var for strict mode

* Expand generated class fields tests for forbidden computed property name values

Ref https://github.com/tc39/test262/pull/1339#issuecomment-342830243

* derived classes have access to private names in base classes, if private names are in scope