Make mi_cmd_break_insert exception-safe.
[gdb]
* breakpoint.c (break_command_1): Return void.
(break_command_really): Return void. Rethrow
exceptions instead of returning.
(gdb_breakpoint): Remove the error_message parameter.
Return void. Rename to set_breakpoint.
* gdb.h (gdb_breakpoint): Rename and move to...
* breakpoint.h (set_breakpoint): ...here.
* mi/mi-cmb-break.c (mi_cmd_break_insert): Restore
event hooks even if exception is thrown. Adjust to
gdb_breakpoint interface changes.
[gdb/testsuite]
* gdb.mi/basic.c (return_1): New function.
* gdb.mi/mi-break.exp: Make sure that failed -break-insert
don't cause future evaluations of function to report
creation of internal breakpoints.