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Vulkan and OpenCL runtime adapters that take from payloads first, and the OpenCL loader verified #1094

Job	Run time
lint	13s
select	14s
graphics install: no side effects on unrelated members	3m 18s
mirror-cn-reachable	27s
workspace (linux llvm 0/1)	8m 10s
workspace (macos default 0/1)	4m 33s
workspace (linux default 0/1)	9m 43s
workspace (windows default 0/1)	6m 41s
timings	8s
full sweep failed — open an issue	0s
	33m 27s