Enable file system buffer reuse for compaction prefetches #3581

Job	Run time
build-linux	16m 56s
build-linux-cmake-mingw	12m 23s
build-linux-cmake-with-folly	27m 41s
build-linux-cmake-with-folly-coroutines	7m 17s
build-linux-cmake-with-folly-lite-no-test	8m 2s
build-linux-make-with-folly	28m 30s
build-linux-make-with-folly-lite-no-test	9m 44s
check-format-and-targets	22s
build-examples	10m 47s
build-linux-cmake-with-benchmark	20m 1s
build-linux-encrypted_env-no_compression	16m 8s
build-linux-release	14m 18s
build-linux-release-rtti	12m 32s
build-fuzzers	8m 41s
build-linux-clang10-asan	16m 56s
build-linux-clang10-clang-analyze	17m 30s
build-linux-clang10-mini-tsan	24m 26s
build-linux-clang10-ubsan	16m 56s
build-linux-clang-13-no_test_run	7m 15s
build-linux-clang-no_test_run	11m 56s
build-linux-gcc-10-cxx20-no_test_run	9m 43s
build-linux-gcc-11-no_test_run	10m 8s
build-linux-gcc-8-no_test_run	8m 51s
build-linux-mini-crashtest	29m 19s
build-linux-unity-and-headers	13m 0s
build-linux-arm	13m 56s
build-linux-java	15m 8s
build-linux-java-pmd	12m 29s
build-linux-static_lib-alt_namespace-status_checked	19m 7s
build-linux-java-static	11m 42s
build-macos	4m 53s
build-macos-cmake (true)	5m 14s
build-macos-java	3m 32s
build-macos-java-static	6m 58s
build-macos-cmake (false)	5m 48s
build-macos-java-static-universal	6m 25s
build-windows-vs2019	55m 14s
	8h 39m 48s

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