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3eb9ff3095
In `-fbounds-safety`, bounds annotations are considered type attributes rather than declaration attributes. Constructing them as type attributes allows us to extend the attribute to apply nested pointers, which is essential to annotate functions that involve out parameters: `void foo(int *__counted_by(*out_count) *out_buf, int *out_count)`. We introduce a new sugar type to support bounds annotated types, `CountAttributedType`. In order to maintain extra data (the bounds expression and the dependent declaration information) that is not trackable in `AttributedType` we create a new type dedicate to this functionality. This patch also extends the parsing logic to parse the `counted_by` argument as an expression, which will allow us to extend the model to support arguments beyond an identifier, e.g., `__counted_by(n + m)` in the future as specified by `-fbounds-safety`. This also adjusts `__bdos` and array-bounds sanitizer code that already uses `CountedByAttr` to check `CountAttributedType` instead to get the field referred to by the attribute.