[llvm] AMDGPU: Fix assert when multi operands to update after folding imm (PR #148205)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -O3 -mtriple=amdgcn-amd-hsa -mcpu=gfx1031 -o - < %s | FileCheck %s
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macurtis-amd wrote:

Added mir test and removed ll test which I could not get to fail without -O3.
Is that good enough?
(My first mir test. Let me know what I go wrong)

https://github.com/llvm/llvm-project/pull/148205