Toolchain-update PR: move debugging hints to extra comment #421

Job	Run time
benchcomp-tests	3m 45s
documentation	1m 59s
perf	26m 21s
regression (macos-13)	37m 29s
write-json-symtab-regression	17m 10s
regression (ubuntu-20.04)	28m 35s
regression (ubuntu-22.04)	28m 11s
regression (macos-14)	23m 23s
	2h 46m 53s

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