missed_breadcrumb() forces intel_engine_dump() unconditionally ('|| 1' debug leftover): full engine state dump, including the DF-4246 over-reading ring hexdump path, runs from callout context every hangcheck period on production kernels

Summary

The '|| 1' is a port-local edit (upstream: plain GEM_SHOW_DEBUG(), which is 0 in production). Every missed-breadcrumb event - from the 1.5s hangcheck timer per affected engine - executes the heavyweight intel_engine_dump from softclock context regardless of debug settings: unthrottled multi-KB console/dmesg flooding plus repeated entry into the DF-4246 over-read path. Unpriv-triggerable (missed-irq syndrome under load). Drop-the-||-1 fix.