Test names in watch_thread_num.exp

[Daniel Jacobowitz]

Hi Luis,

I noticed this in my latest test logs:

+PASS: gdb.base/watch_thread_num.exp: Watchpoint triggered
+PASS: gdb.base/watch_thread_num.exp: Check thread that triggered
+PASS: gdb.base/watch_thread_num.exp: Watchpoint triggered
+PASS: gdb.base/watch_thread_num.exp: Check thread that triggered

Each test is supposed to have a unique name; this makes comparing test
logs more useful.  Could you give these sequence numbers, or something
along those lines?

-- 
Daniel Jacobowitz
CodeSourcery