[llvm] [GlobalIsel] Combine zext of trunc (episode II) (PR #108305)

[Matt Arsenault via llvm-commits]

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arsenm wrote:

> The first combine used `Helper.replaceSingleDefInstWithReg` and ran on the `AMDGPURegBankCombiner`. I prefer the lambda matchinfo, which cannot run after regbank select. Now, I enabled both.

I'm confused. Is there now the zext (trunc) -> and fold implemented somewhere else? 

https://github.com/llvm/llvm-project/pull/108305