StrEnumAttr has been deprecated in favour of EnumAttr, a solution based on AttrDef (https://reviews.llvm.org/D115181). This patch removes StrEnumAttr, along with all the custom ODS logic required to handle it.
See https://discourse.llvm.org/t/psa-stop-using-strenumattr-do-use-enumattr/5710 on how to transition to EnumAttr. In short,
```
// Before
def MyEnumAttr : StrEnumAttr<"MyEnum", "", [
StrEnumAttrCase<"A">,
StrEnumAttrCase<"B">
]>;
// After (pick an integer enum of your choice)
def MyEnum : I32EnumAttr<"MyEnum", "", [
I32EnumAttrCase<"A", 0>,
I32EnumAttrCase<"B", 1>
]> {
// Don't generate a C++ class! We want to use the AttrDef
let genSpecializedAttr = 0;
}
// Define the AttrDef
def MyEnum : EnumAttr<MyDialect, MyEnum, "my_enum">;
```
Reviewed By: rriddle, jpienaar
Differential Revision: https://reviews.llvm.org/D120834
Use TableGen and information in ACC.td for the Default enum in the OpenACC dialect.
This patch generalize what was done for OpenMP for directives.
Follow up patch after D93576
Reviewed By: kiranchandramohan
Differential Revision: https://reviews.llvm.org/D93710