Refactor how locations are stored #3219

Job	Run time
Check formatting	9s
Lint macOS x86_64	3m 19s
Check MSRV	53s
Lint iOS ARMv7s	3m 8s
Lint visionOS Aarch64 simulator	3m 14s
Lint GNUStep + exceptions	1m 26s
Lint header-translator	28s
Lint test-assembly	28s
Test macOS 15 Aarch64	2m 11s
Assembly tests	57s
Verify header translator output	2m 24s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Check framework features	0s
Test Compiler-RT	21s
Test GNUStep with libobjc2 v1.9	1m 10s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	1m 7s
Compiler UI	44s
Test GNUStep with libobjc2 v2.1 on nightly	57s
Test GNUStep 32bit	1m 31s
	24m 27s

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