debug kernels + -fomit-frame-pointer == unhappy gdb

[Juergen Lock]

Just got reminded of this...

 I noticed some kernel builds use -fomit-frame-pointer by default,
even if you do a debug kernel.  That kinda defeats the purpose
since gdb uses the frame pointer when examining the stack, like,
when doing backtraces, i.e. you lose function calls in backtraces
when the kernel is built like that.

 So, should this be changed?

	Juergen