parser: reorder function definitions to match upstream Parse.zig
Reorder function definitions so they follow the same order as upstream zig/lib/std/zig/Parse.zig, making cross-referencing easier. Move OperInfo and NodeContainerField typedefs to the header section, and add forward declarations for parseParamDeclList and operTable that are now needed due to the new ordering. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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