Test

fix: compound assignment with side-effect in lhs miscompiles #4992

Job	Run time
Check	4s
Bootstrap (debug)	4m 8s
Features	21s
Coverage	4m 3s
Bootstrap (release)	4m 45s
Runtimes	30s
Loader	19s
Compiler (windows, node lts/*)	1m 57s
Compiler (windows, node current)	2m 15s
Compiler (ubuntu, node lts/*)	1m 45s
Compiler (macos, node lts/*)	1m 12s
Compiler (ubuntu, node current)	1m 43s
Compiler (macos, node current)	1m 45s
	24m 47s

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