[vm] Adjust unboxing il tests for non-sound null-safe mode. int.parse() and double.parse() are not known to produce non-nullable int outside of sound null-safety mode, so instead use simpler way to define non-constant values for testing. Fixes https://github.com/dart-lang/sdk/issues/51418 TEST=vm/dart/numeric_unboxing_il_test,vm/dart/records_return_value_unboxing_il_test Fixed: 51418 Change-Id: Ie0b55c2f3d632f51656b5f273aee5cb9623c43e3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/283180 Reviewed-by: Liam Appelbe <liama@google.com> Auto-Submit: Slava Egorov <vegorov@google.com> Commit-Queue: Liam Appelbe <liama@google.com>
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