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aecbc92410
This renames MIR instruction `CATCH` and `CATCH_ALL` to `CATCH_LEGACY` and `CATCH_ALL_LEGACY` respectively. Follow-up PRs for the new EH (exnref) implementation will use `CATCH`, `CATCH_REF`, `CATCH_ALL`, and `CATCH_ALL_REF` as pseudo-instructions that return extracted values or `exnref` or both, because we don't currently support block return values in LLVM. So to give the old (real) `CATCH`es and the new (pseudo) `CATCH`es different names, this attaches `_LEGACY` prefix to the old names. This also rearranges `WebAssemblyInstrControl.td` so that the old legacy instructions are listed all together at the end.