This testcase was disabled in the distant past when AIX did not have
support for DWARF and the testcase explicitly invokes DWARF debugging.
This patch re-enables the testcase.
gcc/testsuite/ChangeLog:
* g++.dg/eh/spbp.C: Remove skip on AIX.
/* { dg-do run } */
/* { dg-options "-gdwarf-2" } */
-/* { dg-skip-if "No Dwarf" { { *-*-aix* hppa*-*-hpux* } && { ! hppa*64*-*-* } } } */
+/* { dg-skip-if "No Dwarf" { { hppa*-*-hpux* } && { ! hppa*64*-*-* } } } */
/* { dg-require-effective-target alloca } */
/* This was a bug on x86-darwin, where the register numbering for SP