Fix variance in GlobalBlock #2473

Job	Run time
Check MSRV	20s
Check formatting	8s
Lint macOS 64bit	2m 34s
Lint iOS 32bit	54s
Lint GNUStep + exceptions	1m 17s
Lint header-translator	25s
Lint test-assembly	31s
Test macOS 12	4m 53s
Verify header translator output	1m 2s
Assembly tests	50s
Compiler UI	2m 9s
Check icrate features	0s
Test Compiler-RT	18s
${{ matrix.name }}	0s
Test GNUStep with libobjc2 v1.9	1m 53s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	1m 17s
Test GNUStep with libobjc2 v2.1 on nightly	1m 40s
Test GNUStep 32bit	1m 30s
	21m 41s

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