Remove old code and test cleanup

[christiangnrd]

We don't support macOS version prior to 13 so remove related code.

Also replace some uses of x == nothing to x === nothing.

Diff best looked at with "hide whitespace" option

[github-actions]

Metal Benchmarks

Benchmark suite	Current: b86748d	Previous: 100f831	Ratio
private array/construct	25763.916666666664 ns	26340.333333333332 ns	0.98
private array/broadcast	472458 ns	465791 ns	1.01
private array/random/randn/Float32	768208 ns	827937.5 ns	0.93
private array/random/randn!/Float32	667250 ns	635250 ns	1.05
private array/random/rand!/Int64	574833 ns	562291.5 ns	1.02
private array/random/rand!/Float32	600584 ns	594500 ns	1.01
private array/random/rand/Int64	789166.5 ns	801791 ns	0.98
private array/random/rand/Float32	658750 ns	591208 ns	1.11
private array/copyto!/gpu_to_gpu	572209 ns	645500 ns	0.89
private array/copyto!/cpu_to_gpu	834209 ns	618187.5 ns	1.35
private array/copyto!/gpu_to_cpu	627291.5 ns	798500 ns	0.79
private array/accumulate/1d	1403375 ns	1333083 ns	1.05
private array/accumulate/2d	1414104 ns	1424500 ns	0.99
private array/iteration/findall/int	2167625 ns	2100167 ns	1.03
private array/iteration/findall/bool	1901958 ns	1847000 ns	1.03
private array/iteration/findfirst/int	1716583 ns	1696166.5 ns	1.01
private array/iteration/findfirst/bool	1655562.5 ns	1651958.5 ns	1.00
private array/iteration/scalar	3918542 ns	3657771 ns	1.07
private array/iteration/logical	3299604.5 ns	3264437.5 ns	1.01
private array/iteration/findmin/1d	1578083.5 ns	1565166 ns	1.01
private array/iteration/findmin/2d	1336937.5 ns	1351333.5 ns	0.99
private array/reductions/reduce/1d	1064500 ns	1063291 ns	1.00
private array/reductions/reduce/2d	680333 ns	695645.5 ns	0.98
private array/reductions/mapreduce/1d	1073542 ns	1078084 ns	1.00
private array/reductions/mapreduce/2d	682334 ns	705166 ns	0.97
private array/permutedims/4d	2918667 ns	860084 ns	3.39
private array/permutedims/2d	1039208 ns	862229.5 ns	1.21
private array/permutedims/3d	1613563 ns	919520.5 ns	1.75
private array/copy	564916 ns	574854 ns	0.98
latency/precompile	4512136625 ns	4396587542 ns	1.03
latency/ttfp	6842745646 ns	6698494124.5 ns	1.02
latency/import	879455125 ns	722852834 ns	1.22
integration/metaldevrt	746417 ns	719875 ns	1.04
integration/byval/slices=1	1554396 ns	1530167 ns	1.02
integration/byval/slices=3	10410854.5 ns	9115541.5 ns	1.14
integration/byval/reference	1561250 ns	1520271 ns	1.03
integration/byval/slices=2	2650646 ns	2666416 ns	0.99
kernel/indexing	468417 ns	468541 ns	1.00
kernel/indexing_checked	474583 ns	461292 ns	1.03
kernel/launch	8750 ns	8834 ns	0.99
metal/synchronization/stream	14500 ns	14583 ns	0.99
metal/synchronization/context	15125 ns	15250 ns	0.99
shared array/construct	26500 ns	26069.5 ns	1.02
shared array/broadcast	486000 ns	468333 ns	1.04
shared array/random/randn/Float32	835146 ns	785583 ns	1.06
shared array/random/randn!/Float32	670084 ns	626541.5 ns	1.07
shared array/random/rand!/Int64	570625 ns	564084 ns	1.01
shared array/random/rand!/Float32	613125 ns	598792 ns	1.02
shared array/random/rand/Int64	813917 ns	788666 ns	1.03
shared array/random/rand/Float32	649917 ns	629791 ns	1.03
shared array/copyto!/gpu_to_gpu	90041 ns	96916 ns	0.93
shared array/copyto!/cpu_to_gpu	87958 ns	88583 ns	0.99
shared array/copyto!/gpu_to_cpu	77292 ns	83458 ns	0.93
shared array/accumulate/1d	1390750 ns	1356667 ns	1.03
shared array/accumulate/2d	1414416 ns	1421333 ns	1.00
shared array/iteration/findall/int	1865333.5 ns	1792833 ns	1.04
shared array/iteration/findall/bool	1650291 ns	1620166.5 ns	1.02
shared array/iteration/findfirst/int	1403708 ns	1385791 ns	1.01
shared array/iteration/findfirst/bool	1361688 ns	1376291 ns	0.99
shared array/iteration/scalar	155583 ns	151458 ns	1.03
shared array/iteration/logical	3088125 ns	3042333 ns	1.02
shared array/iteration/findmin/1d	1277833 ns	1274875 ns	1.00
shared array/iteration/findmin/2d	1352562.5 ns	1346333 ns	1.00
shared array/reductions/reduce/1d	735958 ns	694458 ns	1.06
shared array/reductions/reduce/2d	682000 ns	702292 ns	0.97
shared array/reductions/mapreduce/1d	759958 ns	754229 ns	1.01
shared array/reductions/mapreduce/2d	684854 ns	705395.5 ns	0.97
shared array/permutedims/4d	2949041 ns	858875 ns	3.43
shared array/permutedims/2d	1044917 ns	862292 ns	1.21
shared array/permutedims/3d	1607875 ns	923916.5 ns	1.74
shared array/copy	239958 ns	246583 ns	0.97

This comment was automatically generated by workflow using github-action-benchmark.

[maleadt]

LGTM.

Needs rebase.

[christiangnrd]

Test failure unrelated and reported (#466).

[maleadt]

Mark as broken for now?