Better support Dispatch in header-translator #3218

Job	Run time
Check formatting	7s
Check MSRV	57s
Lint macOS x86_64	3m 13s
Lint iOS ARMv7s	3m 7s
Lint visionOS Aarch64 simulator	3m 9s
Lint GNUStep + exceptions	1m 25s
Lint header-translator	29s
Lint test-assembly	34s
Test macOS 15 Aarch64	1m 27s
Assembly tests	1m 10s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Verify header translator output	2m 11s
Check framework features	0s
Test Compiler-RT	1m 11s
Test GNUStep with libobjc2 v1.9	58s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	1m 3s
Compiler UI	49s
Test GNUStep with libobjc2 v2.1 on nightly	55s
Test GNUStep 32bit	1m 16s
	24m 1s

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