gdb/testsuite/

gdb/testsuite/
	Fix compatibility with x32 arch.
	* testsuite/gdb.dwarf2/typeddwarf.exp: Check also is_lp64_target.
	* testsuite/gdb.trace/backtrace.exp: Use is_amd64_regs_target and
	is_x86_like_target.
	* testsuite/gdb.trace/collection.exp: Likewise.
	* testsuite/gdb.trace/report.exp: Likewise.
	* testsuite/gdb.trace/unavailable.exp: Likewise.
	* testsuite/gdb.trace/while-dyn.exp: Likewise.
	* testsuite/lib/gdb.exp (is_amd64_regs_target): New function.
	(is_x86_like_target): Check also is_amd64_regs_target.