Renames `ReturnInstr` to `DartReturnInstr`, and introduces a new
`ReturnBaseInstr` to be the common parent of `DartReturnInstr` and
`NativeReturnInstr`. (Before this CL, `NativeReturnInstr` was a
subtype of `ReturnInstr`.)
In a follow up CL, the `NativeReturnInstr` will get up to two inputs.
https://dart-review.googlesource.com/c/sdk/+/354226
Therefore, the `ReturnBaseInstr` does not inherit from `TemplateInstr`
with 1 input, but instead only inherits from `Instruction`.
TEST=SDK build
TEST=*_il_test.dart
Change-Id: I017eb7802ae6c902b64f1cda20edf4a11408dbe1
Cq-Include-Trybots: luci.dart.try:vm-aot-linux-debug-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/358904
Reviewed-by: Tess Strickland <sstrickl@google.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>
Daco Harkes
77d10f2ed9