Bug ID: 41500
Summary: [AMDGPU] Add tests for fneg dag combining multi-use op
Component: Backend: AMDGPU
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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