Backport "Optimise SpaceEngine.signature" to 3.6.2 #21899
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[Cherry-picked 116f5fe]
[Cherry-picked 3458da7]
[Cherry-picked 8d612de]
Using `constrained` on a TypeLambda means adding one TypeLambda for all the type parameters in tp1, while newTypeVar creates a TypeLambda for each type parameter. [Cherry-picked 28b8c55]
Instead of creating type vars, constraining against them, then instantiating them, just instantiate the PolyType with the scrutinee type args (or the lo/hi bound or bounded wildcard from the param). [Cherry-picked bdafee6]
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Backports #21791 to the 3.6.2 branch.
PR submitted by the release tooling.
[skip ci]