More compact lowering of late variable error messages by front-end

[rakudrama]

The front-end lowering of late variables is too large for dart2js (see #43361) and DDC.

One of the reasons is that the lowering contains comprehensive error messages.
These could be factored so that the call to the error contains only the name, and the rest of the message is provided by the constructor.
Instead of:

throw LateInitializationErrorImpl("Field 'queryParameters' has been assigned during initialization.");
throw LateInitializationErrorImpl("Local 'result' has not been initialized.");

generate:

throw LateInitializationErrorImpl.fieldAssignedDuringInitialization('queryParameters');
throw LateInitializationErrorImpl.localNotInitialized('result');

There should also be a target configuration option to omit the names as the name can be guessed from the stack-trace.
For the best code from dart2js, the LateInitializationErrorImpl constructor without the name should be a separate named constructor (not an optional name argument, as the default occurs at the call site).

/cc @johnniwinther

[johnniwinther]

Does using nameless constructors for errors on locals? I would imagine that the variable in question is not easily deducible from the stack trace.

[rakudrama]

The error will happen in a getter or setter or direct code that implements =local and/or local=. The source location for that variable reference should be the source location for the lowered call / code.

[rakudrama]

Perhaps we could combine the API for this request and #43993 by the Target having a method that takes e.g. an enum for the LateLowering context and returns a choice between named, unnamed and no lowering.
If the source location of a local proved to be too difficult to use in production, then we could elect to used the name.
This also provides a mechanism for removing source names from a production binary.

enum LateLowering {
  nullableUninitializedNonFinalLocal,
  nonNullableUninitializedNonFinalLocal,
  ...
}
enum LateLoweringAction {
  namedLowering,
  unnamedLowering,
  noLowering
}

class Target {
  ...
  LateLoweringAction lateLowering(LateLowering type);
  ...
}