prevent RVO and in-place construction via an MIR pass #3672

Job	Run time
Provide additional context for the workflow	5s
Build release binaries (Linux)	13m 51s
Build release binaries (macOS)	10m 28s
Build source archive	5m 39s
Build docs and release artifacts (Linux)	11m 31s
Build docs and release artifacts (macOS)	11m 42s
Build and test tooling (Linux)	5m 34s
Build and test tooling (macOS)	5m 19s
Test the compiler and stdlib (Linux, batch #0)	10m 49s
Test the compiler and stdlib (Linux, batch #1)	8m 22s
Test the compiler and stdlib (macOS, batch #0)	10m 17s
Test the compiler and stdlib (macOS, batch #1)	10m 11s
Build release artifacts from source archive (Linux)	13m 58s
Build release artifacts from source archive (macOS)	14m 51s
Test release artifacts	1m 43s
All check passed	1s
	2h 14m 21s

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