5ecc0ef6b0
This commit improves the `EnumProp` class, causing it to wrap around an `EnumInfo` just like` EnumAttr` does. This EnumProp also has logic for converting to/from an integer attribute and for being read and written as bitcode. The following variants of `EnumProp` are provided: - `EnumPropWithAttrForm` - an EnumProp that can be constructed from (and will be converted to, if `storeInCustomAttribute` is true) a custom attribute, like an `EnumAttr`, instead of a plain integer. This is meant for backwards compatibility with code that uses enum attributes. `NamedEnumProp` adds a "`mnemonic` `<` $enum `>`" syntax around the enum, replicating a common pattern seen in MLIR printers and allowing for reduced ambiguity. `NamedEnumPropWithAttrForm` combines both of these extensions. (Sadly, bytecode auto-upgrade is hampered by the lack of the ability to optionally parse an attribute.) Depends on #132148
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