Simon Camphausen

The last commit should fix the test failures in the EmitC conversion in #10067.

After testing #392 I spotted some warnings about the usage of legacy file formats in our example scripts. The `.keras` file format if preferred over the plain `.h5` format as...

Changes needed to integrate https://github.com/llvm/llvm-project/pull/91475-

This drops ref block arguments during the dialect conversion instead of removing them manually after it.