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Delete old pq4_accumulate_loop files (replaced by dispatching.h) #4440

Job	Run time
build-pull-request / Linux x86_64 (cmake)	21m 16s
build-pull-request / Format	41s
build-release	0s
build-pull-request / Linux arm64 Dynamic Dispatch (cmake)	20m 19s
build-pull-request / Linux x86_64 AVX512 (cmake)	35m 33s
build-pull-request / Linux x86_64 GPU (cmake)	43m 45s
build-pull-request / Linux x86_64 AVX512_SPR (cmake)	34m 54s
build-pull-request / Linux x86_64 w/ SVS (cmake)	22m 31s
build-pull-request / Linux x86_64 GPU w/ cuVS (cmake)	1h 47m 44s
build-pull-request / Linux x86_64 AVX2 (cmake)	19m 43s
build-pull-request / Linux x86_64 (conda)	27m 1s
build-pull-request / Linux arm64 SVE (cmake)	23m 23s
build-pull-request / Linux x86_64 Dynamic Dispatch (cmake)	30m 3s
build-pull-request / Linux arm64 (conda)	1h 54m 22s
build-pull-request / Windows x86_64 (conda)	27m 26s
build-pull-request / Index serialization backward compatibility / CMake Write -> Conda Read	25m 40s
build-pull-request / Index serialization backward compatibility / Conda Write -> CMake Read	24m 51s
	9h 39m 12s

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