[spirv] Support OpPhi using block arguments
This CL adds another control flow instruction in SPIR-V: OpPhi. It is modelled as block arguments to be idiomatic with MLIR. See the rationale.md doc for "Block Arguments vs PHI nodes". Serialization and deserialization is updated to convert between block arguments and SPIR-V OpPhi instructions. PiperOrigin-RevId: 277161545
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