GitLab

* add fix for the trace_eval

* Add throw for the debug builds

* Formatting

---------
Co-authored-by: Chris Austen <causten@users.noreply.github.com>

#1791 Added hash function for value class. It uses the Visit function and has specialization for the bool_type and <vector> type but was missing specialization for the nullptr. Nullptr caused compilation issues for RHEL, SLES and CentOS.

Enable with MIGRAPHX_ENABLE_CK=1 and --exhaustive-tune tune flag

Sigmoid approximation for GeLU was introduced in #1299 for Fp16. The sigmoid approximation is known to get better perf but lower accuracy. https://arxiv.org/pdf/1606.08415.pdf

partially solves #1656
This PR only handles compilation part of multitarget.