Files
scriptc/tests/diagnostics
Chris Tate 70697b45c3 Give generic arrow bindings Node's behavior before their declarations run
Generic arrow and function-expression bindings compile to shared
instances, and their declarations emit no store. Code that can run before
the declaration then diverged from Node.

- Inside a function, a nested function lowered before the declaration
  reads the binding through a TDZ box that nothing initialized. That
  covers closures above the declaration and hoisted function
  declarations. Such a read threw a ReferenceError even after the
  declaration ran. The declaration now stores the instance its declared
  signature pins into that box.
- At module scope, calls and pinned value reads went straight to the
  instances even when a hoisted function or an earlier closure ran them
  before the declaration. A binding with such a use now has a flag that
  its declaration sets.
  - Uses that can run first check the flag.
  - A let or const throws Node's ReferenceError before the arguments
    run.
  - A var runs the arguments and then throws "is not a function".
- Uses that follow the declaration stay direct calls: later statements,
  closures created after it, its own initializer, and function
  declarations that only such code calls.

A var binding inside a function that is called from a place that can run
before its declaration would need a per-call flag shared with its
closures. That shape now fails with SC1090 instead of calling the
instance.
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