LRU/reclamation work #1043

Job	Run time
build-minimal-sysroots (x86_64)	1m 3s
build-minimal-sysroots (riscv64)	1m 21s
build-minimal-sysroots (arm64)	1m 8s
build-toolchains (ubuntu-latest, x86_64, gnu)	17m 21s
build-toolchains (ubuntu-latest, riscv64, gnu)	12m 20s
build-toolchains (ubuntu-latest, arm64, gnu)	14m 4s
build-toolchains (ubuntu-20.04, x86_64, gnu)	18m 21s
build-toolchains (ubuntu-20.04, riscv64, gnu)	13m 18s
build-toolchains (ubuntu-20.04, arm64, gnu)	14m 56s
build-toolchains (macos-latest, x86_64, gnu)	18m 10s
build-toolchains (macos-latest, riscv64, gnu)	14m 15s
build-toolchains (macos-latest, arm64, gnu)	14m 39s
build-toolchains (ubuntu-latest, llvm, all)	1h 47m 46s
build	2m 6s
build-llvm-arm64	1m 46s
build-arm64	1m 57s
build-llvm	2m 14s
build-llvm-riscv64	1m 26s
build-riscv	1m 44s
run-riscv	0s
run-riscv64-llvm	0s
run-x86_64	0s
run-x86_64-llvm	0s
	4h 19m 55s

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