Refactor message sending #2259

Job	Run time
Check formatting	8s
Check MSRV	1m 30s
Test GNUStep with libobjc2 v1.9	2m 38s
Lint macOS 64bit	4m 5s
Lint iOS 32bit	1m 44s
Test GNUStep with libobjc2 v2.0	2m 21s
Lint GNUStep + exceptions	2m 13s
Test GNUStep with libobjc2 v2.1 on nightly	2m 38s
Test GNUStep 32bit	2m 39s
Lint header-translator	44s
Lint test-assembly	44s
Test macOS 12	6m 54s
Verify header translator output	1m 9s
Assembly tests	1m 6s
Compiler UI	2m 20s
Test Compiler-RT	40s
Check icrate features	0s
${{ matrix.name }}	0s
Test on iOS simulator w. dinghy	0s
	33m 33s

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