Fix multiple issues related to extreme symbol merging (#2755) #9428

Job	Run time
misc	1m 25s
lint (ubuntu-latest)	6m 1s
lint (windows-latest)	11m 30s
build	3m 38s
smoke	6m 9s
test (ubuntu-latest)	8m 42s
lint (noembed)	6m 8s
test (windows-latest)	21m 7s
test (no submodules)	8m 19s
test (noembed)	9m 21s
test (concurrent test programs)	11m 50s
format	1m 56s
tidy	1m 18s
extension	35s
test (macos-latest)	9m 39s
test (race mode)	17m 55s
generate	10m 51s
required	3s
	2h 16m 27s

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