get the mapping of <key, syscallname>

[Frank Ch. Eigler]

Hi -

> > Why not use the "name" variable set by the syscalls tapset?
> 
> LKET does not currently use the syscall tapset because it doesnt use the 
> extra information that this tapset collects from each systemcall.  [...]

But, due to the optimization pass in the translator, only that portion
of the information actually *used* by your script is actually
collected.  Please try it out (check out stap -p2 or -p3 output to
confirm).

> [...]  Its not just the string printing that's costly, its also
> searching the system call name with in CONTEXT->probe_point.  [...]

Rolling your own code to manually scan through "probe_point" is not
really necessary or appropriate.  There is a "probefunc()" function
you can use for now.

- FChE