At the end of codegen, 'trace' the generated JavaScript to the `.cfg`
file, and 'trace' the JavaScript after the generator rewrite when this
happens. This gives an easy way to see the non-final JavaScript from
before the transform. The 'trace' of the JavaScript is a little bit of
an abuse of the `.cfg` file format, but it is convenient to see the
SSA CFG and JavaScript with the same tool.
For this to work, js_ast printing needs to work for pre-finalized
ASTs. Most of this change is implementing `isFinalized` for every AST
node, and printing something indicative of the non-finalized nodes. For
example, unfinalized holders are printed as `Holder"<something>"`.
Change-Id: I30b3f141a876f1dc3539132d65f3aafc722589e5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/218883
Commit-Queue: Stephen Adams <sra@google.com>
Reviewed-by: Joshua Litt <joshualitt@google.com>
Stephen Adams
7fd4f25b62