Avoid more unnecessary mk_ty calls in Ty::super_fold_with. #37979
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This speeds up several rustc-benchmarks by 1--5%.
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Avoid more unnecessary mk_ty calls in Ty::super_fold_with. This speeds up several rustc-benchmarks by 1--5%. This PR is the lovechild of #37108 and #37705. ``` futures-rs-test 4.059s vs 4.011s --> 1.012x faster (variance: 1.016x, 1.026x) helloworld 0.236s vs 0.239s --> 0.986x faster (variance: 1.051x, 1.014x) html5ever-2016- 3.831s vs 3.824s --> 1.002x faster (variance: 1.020x, 1.019x) hyper.0.5.0 4.928s vs 4.936s --> 0.998x faster (variance: 1.003x, 1.012x) inflate-0.1.0 4.135s vs 4.104s --> 1.007x faster (variance: 1.026x, 1.028x) issue-32062-equ 0.309s vs 0.303s --> 1.017x faster (variance: 1.019x, 1.084x) issue-32278-big 1.818s vs 1.797s --> 1.011x faster (variance: 1.011x, 1.008x) jld-day15-parse 1.304s vs 1.271s --> 1.026x faster (variance: 1.018x, 1.012x) piston-image-0. 10.938s vs 10.921s --> 1.002x faster (variance: 1.025x, 1.016x) reddit-stress 2.327s vs 2.208s --> 1.054x faster (variance: 1.016x, 1.006x) regex-0.1.80 8.796s vs 8.727s --> 1.008x faster (variance: 1.012x, 1.019x) regex.0.1.30 2.294s vs 2.249s --> 1.020x faster (variance: 1.013x, 1.026x) rust-encoding-0 1.914s vs 1.886s --> 1.015x faster (variance: 1.027x, 1.026x) ```
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This speeds up several rustc-benchmarks by 1--5%.
This PR is the lovechild of #37108 and #37705.