compiler: introduce an IR for the code generators #3697

Job	Run time
Provide additional context for the workflow	5s
Build release binaries (Linux)	13m 10s
Build release binaries (macOS)	19m 3s
Test the compiler and stdlib (Linux, batch #0)	11m 57s
Test the compiler and stdlib (Linux, batch #1)	8m 48s
Test the compiler and stdlib (macOS, batch #0)	10m 39s
Test the compiler and stdlib (macOS, batch #1)	9m 49s
Build docs and release artifacts (Linux)	11m 25s
Build docs and release artifacts (macOS)	11m 59s
Build source archive	4m 31s
Build and test tooling (Linux)	5m 39s
Build and test tooling (macOS)	5m 42s
Build release artifacts from source archive (Linux)	13m 40s
Build release artifacts from source archive (macOS)	14m 7s
Test release artifacts	1m 39s
All check passed	1s
	2h 22m 14s

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