https://bugs.llvm.org/show_bug.cgi?id=41500

            Bug ID: 41500
           Summary: [AMDGPU] Add tests for fneg dag combining multi-use op
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AMDGPU
          Assignee: unassignedb...@nondot.org
          Reporter: tpr.l...@botech.co.uk
                CC: llvm-bugs@lists.llvm.org

D60633 fixes a bug where fneg was dag combining a multi-use fadd, but creating
a new fadd got folded, and the dag combiner asserted.

As part of that fix, I also added precautionary fixes for the same situation
with fneg combinining with fmul, fma, fmax, fmin, fmed3. However I do not have
reproducers for those cases.

This bug is to create reproducers for a hypothetical assert for fneg combining
with each of those ops, when the fix in D60633 is not present.

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