[rfa] New test sigbpt.{c,exp}

[Andrew Cagney]

> mec> How about:
> mec> 
> mec>   (1) before running the program, 'disassemble bowler'
> mec>   (2) at the breakpoint, 'x/i $pc'
> mec>   check that the output of (2) matches one of the lines in (1)

FYI, that's effectively what I did.  It checks the $pc address against a 
table of valid instruction addresses.  It doesn't match it fails, via 
gdb_test_multiple internals.  All thats missing is a pattern to match 
any other pc address in bowler.

Trying to single-step after corrupting the $pc would be meaningless.

Andrew