[PATCH] Test for double freeing in breakpoint_re_set_one

[Andrew Cagney]

> Per Andrew's request, I have added the following test to the testsuite
> in gdb.base.  This particular problem, since it involves memory corruption,
> won't reliably show itself (i.e., on earlier versions of GDB) unless one
> is "lucky" enough to have it cause a segmentation fault or one is using
> a checked version of malloc/free in GDB.  I will leave to others Andrew's
> question concerning file descriptors on IDT/SIM.  

Just FYI, I did some digging.  The IDT/SIM problem would have been on 
cygwin.  The simulators would hold open the executable making the 
instalation of a new one impossible.  Since the simulators now close the 
bfd cache (releasing the executable) that specific problem will no 
longer occure.  However, I think GDB still keeps the executable open 
leading to the second of the problems.

Andrew