Automatic toolchain upgrade improvements #144

Job	Run time
benchcomp-tests	5m 28s
bookrunner	37m 27s
perf	37m 57s
releasebundle-macos (macos-11)	10m 5s
regression (macos-11)	43m 20s
regression (ubuntu-20.04)	32m 39s
regression (ubuntu-22.04)	29m 47s
releasebundle-ubuntu	28m 57s
write-json-symtab-regression	23m 3s
	4h 8m 43s

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