[Metal] Add correct addrspace to global constants #1443

Job	Run time
Julia 1.11 x86_64-linux-gnuassert	4m 29s
Julia 1.10 - ubuntu-latest - x64	1m 58s
Julia 1.11 x86_64-linux-gnuassert --opaque-pointers	4m 52s
Julia 1.10 - macOS-latest - x64	2m 18s
Julia 1.10 - windows-latest - x64	2m 36s
Julia 1.11 - ubuntu-latest - x64	3m 21s
Julia 1.11 - macOS-latest - x64	3m 22s
Julia 1.11 - windows-latest - x64	4m 19s
Julia nightly - ubuntu-latest - x64	55s
Julia nightly - macOS-latest - x64	1m 31s
Julia nightly - windows-latest - x64	1m 46s
Julia 1.10 --opaque-pointers - ubuntu-latest - x64	1m 54s
Julia 1.10 --opaque-pointers - macOS-latest - x64	2m 11s
Julia 1.10 --opaque-pointers - windows-latest - x64	2m 37s
Julia 1.11 --opaque-pointers - ubuntu-latest - x64	3m 19s
Julia 1.11 --opaque-pointers - macOS-latest - x64	3m 26s
Julia 1.11 --opaque-pointers - windows-latest - x64	3m 56s
	48m 50s

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