stap make check - process_test and sched_test failure

[Li Guanglei]

Hien Nguyen ??:
> These two tests consistently failed on my RHEL4U4 ppc64 box.
> 
> Here's the error log for process_test
> semantic error: unresolved target-symbol expression: identifier '$sig' 
> [..]

I tried and found the trouble is that the compiler will optimize some 
functions e.g. handle_signal as inline. And currently we can't fetch 
the arguments of an inline function.