- syntax
- Deferred namespace objects
- Behavior of synchronous deferred modules
- Errors for synchronous cases

I will open another PR (or push another commit here) for tests about
async modules, since I still have to finish polishing it up.

There are a few details of the proposal that are still in flux because
of some bugs, so this PR does not include tests for them:
- `Symbol.toStringTag` of deferred namespace objects
- `test/language/import/import-defer/evaluation-sync/evaluation-*` for the other object operations
- `import.defer`, which currently doesn't actually defer due to a problem with `.then`

  * Add deepEqual.js include where needed
  * Add module flag where needed
  * Fix some typos
  * In evaluation-ignore-set, add a try block to catch typeerrors from assignment

Need the bug URL (OOPS!).

Reviewed by NOBODY (OOPS!).

Explanation of why this fixes the bug (OOPS!).

* test/language/import/import-defer/deferred-namespace-object/dep-defer-ns_FIXTURE.js:
* test/language/import/import-defer/deferred-namespace-object/identity.js:
* test/language/import/import-defer/deferred-namespace-object/object-properties.js:
* test/language/import/import-defer/errors/get-other-while-dep-evaluating/main.js:
* test/language/import/import-defer/errors/get-other-while-evaluating/main.js:
* test/language/import/import-defer/errors/get-self-while-defer-evaluating/main.js:
* test/language/import/import-defer/errors/get-self-while-evaluating.js:
* test/language/import/import-defer/errors/module-throws/defer-import-after-evaluation.js:
* test/language/import/import-defer/errors/module-throws/third-party-evaluation-after-defer-import.js:
* test/language/import/import-defer/errors/module-throws/trigger-evaluation.js:
* test/language/import/import-defer/errors/resolution-error/import-defer-of-syntax-error-fails.js:
* test/language/import/import-defer/errors/syntax-error/import-defer-of-syntax-error-fails.js:
* test/language/import/import-defer/evaluation-sync/evaluation-ignore-get-symbol.js:
* test/language/import/import-defer/evaluation-sync/evaluation-ignore-getPrototypeOf.js:
* test/language/import/import-defer/evaluation-sync/evaluation-ignore-isExtensible.js:
* test/language/import/import-defer/evaluation-sync/evaluation-ignore-preventExtensions.js:
* test/language/import/import-defer/evaluation-sync/evaluation-ignore-set.js:
* test/language/import/import-defer/evaluation-sync/evaluation-ignore-setPrototypeOf.js:
* test/language/import/import-defer/evaluation-sync/evaluation-trigger-get-string.js:
* test/language/import/import-defer/evaluation-sync/import-defer-does-not-evaluate.js:
* test/language/import/import-defer/evaluation-sync/module-imported-defer-and-eager.js:
* test/language/import/import-defer/syntax/import-attributes.js:
* test/language/import/import-defer/syntax/valid-default-binding-named-defer.js:
* test/language/import/import-defer/syntax/valid-defer-namespace.js: