[NFC][IR] Type: add getWithNewType() method#106

Merged

nikic merged 1 commit intorust-lang:rustc/12.0-2021-04-15from

alexcrichton:another-backport

Apr 30, 2021

Commits on Apr 29, 2021

[NFC][IR] Type: add getWithNewType() method

LebedevRI
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alexcrichton
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