[PATCH 3 of 4] Add hierarchical discriminator for loop versioning

[Kugan Vivekanandarajah]

I would like to again ping the patch posted in https://gcc.gnu.org/pipermail/gcc-patches/2025-November/700704.html

Add hierarchical discriminator support for loop versioning pass.
Assigns copyid discriminators to distinguish different loop versions.

gcc/ChangeLog:

        * gimple-loop-versioning.cc (loop_versioning::version_loop): Assign
        copyid discriminators to distinguish different loop versions.

gcc/testsuite/ChangeLog:

        * gcc.dg/hierarchical-discriminator-loop-version.c: New test.


Bootstrapped and regression tested on aarch64-linux-gnu with no new regressions. Is this OK?

Thanks,
Kugan

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