Add special cases endless loops in execfreq estimator
fix Phi push_through_perm fix
rework compilerlib entity stuff

now the frontend is only responsible to mangle the ld_name, entity
creation is left to libfirm which now also caches the entities.
types: Remove mtp_property_runtime.

The only user is unreachable (ignore_runtime is false).
types: Remove the unused mtp_property_intrinsic.
belower: Improve Perm decomposition.
block labels are not PIC affected