t/io_uring: only load tail once per reap loop #927

Job	Run time
build-containers (debian, debian, bookworm, x86_64)	12m 48s
build (linux-gcc)	13m 58s
build-containers (fedora, fedora, 40, x86_64)	14m 1s
build (linux-clang)	13m 14s
build-containers (alma, almalinux, 9, x86_64)	14m 0s
build (macos)	12m 44s
build-containers (oracle, oraclelinux, 9, x86_64)	6h 0m 3s
build (linux-i686-gcc)	13m 46s
build-containers (rocky, rockylinux, 9, x86_64)	14m 22s
build (android)	32s
build-containers (ubuntu, ubuntu, noble, i686)	12m 52s
build-containers (ubuntu, ubuntu, noble, x86_64)	14m 24s
build (windows-cygwin-64)	14m 55s
build (windows-cygwin-32)	15m 5s
build (windows-msys2-64)	13m 3s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	41s
	9h 0m 28s

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