[gdb/testsuite] Add gdb.opt/break-on-_exit.exp
Add a test-case to excercise the problem scenario reported in PR28527 and fixed in commit a50bdb99 "[gdb/tdep, rs6000] Don't skip system call in skip_prologue": - set a breakpoint on _exit, and - verify that it triggers. Note that this is not a regression test for that commit. Since the actual code in _exit may vary across os instances, we cannot guarantee that the problem will always trigger with this test-case. Rather, this test-case is a version of the original test-case (gdb.threads/process-dies-while-detaching.exp) that is minimal while still reproducing the problem reported in PR28527, in that same setting. The benefit of this test-case is that it exercise real-life code and may expose similar problems in other settings. Also, it provides a much easier test-case to investigate in case a similar problem occurs. Tested on x86_64-linux and ppc64le-linux.
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