Jeff Niu 5cf5708628 [mlir][ElementsAttr] Change value_begin_impl to try_value_begin_impl
This patch changes `value_begin_impl` to a faillable
`try_value_begin_impl` so that specific cases can fail iteration if the
type doesn't match the internal storage.

Reviewed By: rriddle

Differential Revision: https://reviews.llvm.org/D132904
2022-08-30 14:12:46 -07:00
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