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fc02bb5cd8
The switch to reinstantiating conversion patterns for the conversion
from FHE to TFHE in commit 73fd6c5fe7
caused all attributes of `scf.for` operations to be dropped during the
conversion. This included the custom attribute `parallel`, which is
exploited further down the compilation pipeline to generate parallel
code. As a result, the performance of end-to-end benchmarks dropped
significantly.
This patch copies all attributes of `scf.for` operations upon
reinstantiation, which solves the performance regression.