Petar Avramovic 36beaa3ba3 Reland AMDGPU/GlobalISel: Combine zext(trunc x) to x after RegBankSelect
Recommit bf5a5826504754788a8f1e3fec7a7dc95cda5782. Depends on
4c8fb7ddd6fa49258e0e9427e7345fb56ba522d4 which was reverted.

RegBankSelect creates zext and trunc when it selects banks for uniform i1.
Add zext_trunc_fold from generic combiner to post RegBankSelect combiner.

Differential Revision: https://reviews.llvm.org/D95432
2021-03-05 11:05:37 +01:00
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