build abstract consts without typeck for fully qualified associated consts #89231
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When we build an abstract const for the const arg in
foo::<{ <T as Trait>::ASSOC }>()
we currently typeck the anon constant and then build an abstract const by walking thir. this PR adds a special case for when the anon const is a fully qualified assoc const, instead of typeck'ing and using thir we will just lower it to to defid + substs pair where the defid is the associated item on the trait (the same result using thir would give us but without the cycles :P).r? @lcnr