testsuite: Remove unnecessary DWARF2 xfails on AIX

testsuite: Remove unnecessary DWARF2 xfails on AIX

A number of DWARF2 testsuite xfails no longer trigger on AIX.  This patch
removes the unnecessary XFAIL decorations that cause extraneous notices
that clutter the testsuite output.

gcc/testsuite/ChangeLog:

2020-09-29  David Edelsohn  <dje.gcc@gmail.com>

	* g++.dg/debug/dwarf2/align-1.C: Remove AIX XFAIL.
	* g++.dg/debug/dwarf2/align-2.C: Same.
	* g++.dg/debug/dwarf2/align-3.C: Same.
	* g++.dg/debug/dwarf2/align-4.C: Same.
	* g++.dg/debug/dwarf2/align-5.C: Same.
	* g++.dg/debug/dwarf2/align-6.C: Same.
	* g++.dg/debug/dwarf2/defaulted-member-function-1.C: Same.
	* g++.dg/debug/dwarf2/defaulted-member-function-2.C: Same.
	* g++.dg/debug/dwarf2/defaulted-member-function-3.C: Same.
	* g++.dg/debug/dwarf2/inline-var-1.C: Same.
	* g++.dg/debug/dwarf2/inline-var-2.C: Same.
	* g++.dg/debug/dwarf2/inline-var-3.C: Same.
	* g++.dg/debug/dwarf2/noreturn-function.C: Same.
	* g++.dg/debug/dwarf2/ptrdmem-1.C: Same.
	* g++.dg/debug/dwarf2/ref-2.C: Same.
	* g++.dg/debug/dwarf2/ref-3.C: Same.
	* g++.dg/debug/dwarf2/ref-4.C: Same.
	* g++.dg/debug/dwarf2/refqual-1.C: Same.
	* g++.dg/debug/dwarf2/refqual-2.C: Same.
	* gcc.dg/debug/dwarf2/align-1.c: Same.
	* gcc.dg/debug/dwarf2/align-2.c: Same.
	* gcc.dg/debug/dwarf2/align-3.c: Same.
	* gcc.dg/debug/dwarf2/align-4.c: Same.
	* gcc.dg/debug/dwarf2/align-5.c: Same.
	* gcc.dg/debug/dwarf2/align-6.c: Same.
	* gcc.dg/debug/dwarf2/align-as-1.c: Same.
	* gcc.dg/debug/dwarf2/dwarf2-macro.c: Same.
	* gcc.dg/debug/dwarf2/dwarf2-macro2.c: Same.
	* gcc.dg/debug/dwarf2/lang-c89.c: Same.
	* gcc.dg/debug/dwarf2/noreturn-function-attribute.c: Same.
	* gcc.dg/debug/dwarf2/noreturn-function-keyword.c: Same.
	* gcc.dg/debug/dwarf2/pr71855.c: Same.
	* gcc.dg/debug/dwarf2/inline5.c: Add XFAIL on AIX.