support Ada EH ABI v1

[Tom Tromey]

>>>>> "Alexandre" == Alexandre Oliva <oliva@adacore.com> writes:

Alexandre> Ok to install?

Alexandre> for  gdb/ChangeLog

Alexandre> 	* ada-lang.c (exception_support_info_v0): Renamed from...
Alexandre> 	(default_exception_support_info): ... this.  Create new
Alexandre> 	definition for v1.
Alexandre> 	(ada_has_this_exception_support): Look up catch_handlers_sym.
Alexandre> 	(ada_exception_support_info_sniffer): Try v0 after default.

Thank you for the patch.
This is OK.

Tom