Heejin Ahn 1c7b841088 [WebAssembly] Make tag attribute's encoding uint8 ...

This changes the encoding of the `attribute` field, which currently only
contains the value `0` denoting this tag is for an exception, from
`varuint32` to `uint8`. This field is effectively unused at the moment
and reserved for future use, and it is not likely to need `varuint32`
even in future.
See https://github.com/WebAssembly/exception-handling/pull/162.

This does not change any encoded binaries because `0` is encoded in the
same way both in `varuint32` and `uint8`.

Reviewed By: tlively

Differential Revision: https://reviews.llvm.org/D104571

2021-06-21 21:22:39 -07:00

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