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35622a93bb
This commit adds builders of the form
```
static void build(..., [TypeRange resultTypes],
ValueRange operands, const Properties &properties,
ArrayRef<NamedAttribute> discardableAttributes = {},
[unsigned numRegions]);
```
to go alongside the existing
result/operands/[inherent + discardable attribute list] collective
builders.
This change is intended to support a refactor to the declarative rewrite
engine to make it populate the `Properties` struct instead of creating a
`DictionaryAttr`, thus enabling rewrite rules to handle non-`Attribute`
properties.
More generally, this means that generic code that would previously call
`getAttrs()` to blend together inherent and discardable attributes can
now use `getProperties()` and `getDiscardableAttrs()` separately, thus
removing the need to serialize everything into a temporary
`DictionaryAttr`.