The validation pass added attribute checks on rescale rounding mode, but
the tosa-to-linalg-pipeline did not specify support for the doubleround
extension, causing rescale with doubleround to be rejected by the
validation in the tosa-to-linalg-pipeline.
One method of fixing this would be to only enable the attribute checks
when the "strictOpSpecAlignment" validation option is enabled. However,
I feel this is the wrong direction of travel. Long-term it would be nice
if the tosa-to-linalg-pipeline specified all the extensions it supports,
gracefully rejecting operations that require unsupported extensions.
Therefore, this change declares support for the doubleround extension to
fix the legalization failure with the ambition of adding more extensions
in the future.
4f6379069e