[ddc] Generate code to call specialized as helpers from package:_rti

[nshahan]

The shared rti library contains some specialized cast helper methods for some core types. ex:

sdk/sdk/lib/_internal/js_shared/lib/rti.dart

Line 1793 in 7134a45

int _asInt(Object? object) {

sdk/sdk/lib/_internal/js_shared/lib/rti.dart

Line 1818 in 7134a45

int? _asIntQ(dynamic object) {

DDC should generate code to invoke these methods directly when possible.

These can replace some existing calls to methods that are a legacy from the old type system allowing for some cleanup. ex:

sdk/sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart

Line 743 in 7134a45

asInt(obj) {

sdk/sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart

Line 756 in 7134a45

asNullableInt(obj) => obj == null ? null : asInt(obj);

[rakudrama]

Attempt: https://dart-review.googlesource.com/c/sdk/+/420380

[rakudrama]

Another 'specialization' would be to use, say
dart_rti.findType("core|Duration?")
instead of
dart_rti._Universe.eval(dart_rti._theUniverse(), "core|Duration?", true)
This is only valid for normalized types, but when you have a ground-term type, it can be normalized by the compiler.

If the type can't be pre-normalized, we could add another helper like findType.

The advantage, in addition to a ~5% code size reduction, is the shared helper will be hot, and should be jitted by the JavaScript engine.