[WebAssembly] Support binary generation for new EH (#109027) This adds support for binary generation for the new EH proposal. So far the only case that we emitted variable immediate operands in binary has been `br_table`'s destinations. (Other `variable_ops` uses in TableGen files are register operands, such as the operands of `call`, so they don't get emitted in binary as a part of the same instruction.) With this PR, variable immediate operands can include `try_table`'s operands: - The number of of catch clauses - catch clauses sub-opcodes - `catch`: 0x00 - `catch_ref`: 0x01 - `catch_all`: 0x02 - `catch_all_ref`: 0x03 - catch clauses' destinations With `try_table`, we now have variable expr operands for `try_table`'s catch clauses' tags. We treat their fixups in the same way we do for tags in other instructions such as in `throw`. Diff without whitespace will be easier to view.
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