Fix #8905: break cycles in instantiateToSubType #9072
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Because MatchAliases are bounds, it's unsafe to do a traversal that recursively inspects bounds. It's kind of a pit fall...
I manually inspected all calls to loBound/hiBound and found another place in the compiler where they are use during a traversal. The added test case fails on master with a SO, just like scala#8905.
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