Refactor message sending #2260

Job	Run time
Check MSRV	1m 26s
Lint macOS 64bit	4m 9s
Check formatting	12s
Lint iOS 32bit	1m 7s
Test GNUStep with libobjc2 v1.9	2m 24s
Lint GNUStep + exceptions	1m 40s
Test GNUStep with libobjc2 v2.0	2m 6s
Lint header-translator	44s
Test GNUStep with libobjc2 v2.1 on nightly	2m 27s
Lint test-assembly	35s
Test GNUStep 32bit	2m 26s
Test macOS 12	6m 58s
Verify header translator output	58s
Assembly tests	1m 30s
Compiler UI	1m 47s
${{ matrix.name }}	0s
Check icrate features	0s
Test Compiler-RT	52s
Test on iOS simulator w. dinghy	0s
	31m 21s

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