Enable call thunks and call depth tracking debugging

configname: CONFIG_CALL_THUNKS_DEBUG

Linux Kernel Configuration
└─>Mitigations for speculative execution vulnerabilities
└─>Enable call thunks and call depth tracking debugging
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Enable call/ret counters for imbalance detection and build in
a noisy dmesg about callthunks generation and call patching for
trouble shooting. The debug prints need to be enabled on the
kernel command line with 'debug-callthunks'.
Only enable this when you are debugging call thunks as this
creates a noticeable runtime overhead. If unsure say N.