Backport "Avoid the TypeVar.inst trap" to LTS #21139
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`tvar.inst` gives the _permanent_ instance of a type variable `tvar`. Even if `tvar.isInstantiated` is true its `inst` can still be NoType. This is a trap that caused a regression in the code of glb. This commit fixes the regression and introduces different names that will hopefully avoid the trap in the future. Fixes #20154 [Cherry-picked 2863a29][modified]
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No regressions detected in the community build up to lts-20902. |
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Backports #20160 to the LTS branch.
PR submitted by the release tooling.
[skip ci]