LRU/reclamation work #1039

Job	Run time
build-minimal-sysroots (x86_64)	1m 7s
build-minimal-sysroots (riscv64)	1m 14s
build-minimal-sysroots (arm64)	1m 10s
build-toolchains (ubuntu-latest, x86_64, gnu)	35s
build-toolchains (ubuntu-latest, riscv64, gnu)	41s
build-toolchains (ubuntu-latest, arm64, gnu)	31s
build-toolchains (ubuntu-20.04, x86_64, gnu)	31s
build-toolchains (ubuntu-20.04, riscv64, gnu)	53s
build-toolchains (ubuntu-20.04, arm64, gnu)	24s
build-toolchains (macos-latest, x86_64, gnu)	1m 5s
build-toolchains (macos-latest, riscv64, gnu)	1m 10s
build-toolchains (macos-latest, arm64, gnu)	49s
build-toolchains (ubuntu-latest, llvm, all)	1m 35s
build	3m 9s
build-llvm-arm64	2m 51s
build-llvm	3m 2s
build-arm64	2m 55s
build-llvm-riscv64	2m 35s
build-riscv	2m 46s
run-riscv	0s
run-x86_64	0s
run-riscv64-llvm	0s
run-x86_64-llvm	0s
	29m 3s

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