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Enable LLVM optimizations balanced and aggressive #1557

Job	Run time
Tests / cargo-clippy	40s
Tests / cargo-fmt	19s
Tests / cargo-deny	34s
Tests / vale	7s
Tests / amd64-linux-gnu	4m 37s
Tests / amd64-linux-musl	6m 30s
Tests / amd64-mac-native	4m 48s
Tests / arm64-mac-native	3m 23s
Tests / inko-fmt	1m 0s
Tests / amd64-freebsd-native	5m 16s
Standard library documentation	0s
Documentation	0s
Nightly container	0s
	27m 14s

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