LRU/reclamation work #1044

Job	Run time
build-minimal-sysroots (x86_64)	57s
build-minimal-sysroots (riscv64)	1m 25s
build-minimal-sysroots (arm64)	57s
build-toolchains (ubuntu-latest, x86_64, gnu)	17m 50s
build-toolchains (ubuntu-latest, riscv64, gnu)	40s
build-toolchains (ubuntu-latest, arm64, gnu)	31s
build-toolchains (ubuntu-20.04, x86_64, gnu)	19m 43s
build-toolchains (ubuntu-20.04, riscv64, gnu)	35s
build-toolchains (ubuntu-20.04, arm64, gnu)	25s
build-toolchains (macos-latest, x86_64, gnu)	54s
build-toolchains (macos-latest, riscv64, gnu)	1m 13s
build-toolchains (macos-latest, arm64, gnu)	1m 52s
build-toolchains (ubuntu-latest, llvm, all)	1h 53m 55s
build-llvm	2m 25s
build	2m 33s
build-arm64	1m 52s
build-llvm-arm64	1m 42s
build-llvm-riscv64	1m 58s
build-riscv	1m 27s
run-riscv	0s
run-riscv64-llvm	0s
run-x86_64	0s
run-x86_64-llvm	0s
	2h 52m 54s

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