Closes #1634.

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.

* Add missing generators feature flags

* Generate files

* Add generators flags

* fixup! Add generators flags

This pattern makes expectations more explicit by making test files more
literal.

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Ref https://bugzilla.mozilla.org/show_bug.cgi?id=1364608

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

In browsers length is a valid property of window, so they would have a normal
completion instead of a ReferenceError

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

- Insert a missing .next() call
- Avoid overlapping names used in test cases

Case files like `src/dstr-binding/ary-ptrn-elem-ary-elision-init.case` are already setting
bindings named `g`. Renaming them in the templates prevents overlapping names.

Closes #867
Ref #865

Extend the test generation tool to emit the recently-modified format of
the "negative" meta-data. Update the effected test case files
accordingly.

* Extend tests for class "name" inference

Ensure that when a class defines a static "name" method, that method
definition prevents the "name" inference behavior.

* Re-generate tests

Add test templates for destructuring binding as it occurs in
previously-overlooked productions (various IterationStatements and the
TryStatement).