Revert: PR #10037: [NVIDIA XLA] Copy backend config for derived instruction that has same opcode
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Revert: PR #10037: [NVIDIA XLA] Copy backend config for derived instruction that has same opcode

Imported from GitHub PR https://github.com/openxla/xla/pull/10037

SetupDerivedInstruction copies many properties like frontend_attributes, metadata and etc, but it doesnt transfer over backend configs. If the derived instruction has the same opcode as the current one, the backend config is most likely applicable, this change copies over the backend config in that situation.
