`late` fields are obfuscated in the debugger

[elliette]

Example:

See cl/637897346 for context.

Some notes:

late fields used to be de-obfuscated by DWDS: #1355

This was removed in #2159 and replaced with the DDC runtime debugger API's getObjectFieldNames method.

I see that the DDC runtime API does try to handle late fields: https://github.com/dart-lang/sdk/blob/1a9acb9171a4a6b69d5e537438d3191ff59cd6da/sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/debugger.dart#L546-L549

FYI @nshahan @Markzipan

[nshahan]

I've landed fixes for late local variables with these two changes (I think that is what we were discussing with this issue).

• Hide more temporary variables when debugging #2445
• https://dart-review.googlesource.com/c/sdk/+/369506

There is technically DDC uses a different representation for class fields, and library level fields so those should be considered independently from each other and from the local variables.