[Bug target/81708] The x86 stack canary location should be customizable

[hpa at zytor dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81708

--- Comment #9 from H. Peter Anvin <hpa at zytor dot com> ---
In some applications it might even be appropriate to use the RDPID instruction
and store the canary in the IA32_TSC_AUX MSR.