Fix for AMDGPU MUL_I24 known bits calculation
Summary: At present, the code calculating known bits of AMDGPU MUL_I24 confuses the concepts of "non-negative number" and "positive number". In some situations, it results in incorrect code. I have a case where the optimizer replaces the result of calculating MUL_I24(-5, 0) with -8. Reviewers: foad, arsenm Reviewed By: arsenm Subscribers: foad, arsenm, kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, hiraditya, llvm-commits Tags: #llvm Patch by Eugene Kuznetsov. Differential Revision: https://reviews.llvm.org/D70367
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