Make casts to int safe in dart2wasm. (#1416) #1076

Job	Run time
analyzer_and_format; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_ser...	41s
mono_repo self validate	14s
analyzer_and_format; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_s...	37s
unit_test; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 27s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/an...	3m 38s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test -p chrome`	1m 13s
unit_test; Dart 3.0.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/en...	57s
unit_test; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 0s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/anno...	3m 16s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/ensu...	53s
unit_test; Dart dev; PKG: json_serializable; `dart test -p chrome`	56s
ensure_build; Dart dev; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pres...	2m 16s
ensure_build; Dart 3.0.0; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pr...	2m 7s
	19m 15s

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