KS2012: Improving tracing and debugging

Neither larger distros and Mozilla do this for user-space crashes. The line information is added to the crash data of the stripped code afterwards, by using a non-stripped version of the binary.

This is done either locally or in crash upload service. Here's a description of the Ubuntu service:
https://wiki.ubuntu.com/Apport

I.e. when you strip the kernel, you keep the non-stripped version also around and add CRC for the full one to the stripped kernel you install & boot with, so that the crash "retrace" tool can verify that they match. Debian's dh_strip has script that does this the stripping & CRC adding with objdump.

Distro tools use Gdb for adding the line information, but kernel may need its own tool which developer can user on his own kernel builds.