[WIP] Support hybrid LTO/non-LTO rlibs. #4105

Job	Run time
rustfmt	12s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	2m 28s
test (macos-latest, aarch64-apple-darwin)	1m 25s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	2m 26s
test (macos-13, x86_64-apple-darwin)	3m 15s
test (windows-latest, x86_64-pc-windows-msvc)	3m 9s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	1m 55s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	1m 36s
bench	2m 31s
test (windows-latest, x86_64-pc-windows-gnu)	3m 22s
test_llvm	1m 0s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	1m 25s
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	1m 18s
dist (windows-latest, x86_64-pc-windows-msvc)	3m 3s
dist (macos-13, x86_64-apple-darwin)	4m 12s
dist (macos-latest, aarch64-apple-darwin)	1m 22s
dist (windows-latest, x86_64-pc-windows-gnu)	3m 27s
release	0s
	38m 6s

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