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d39cf98931
Add a count-only mode to the Writer (advance pos without storing) and factor the section walk into emit_module, so encode and the new encoded_size(m) share one path. encoded_size returns the exact byte count encode will produce -- the SPIR-V analog of an ISA's encode_max_code_size, here exact rather than an upper bound. The printer now sizes its scratch buffer with it instead of retry-on-overflow. Verified: encoded_size == encode byte_count; suite 10 passed.