[gdb/testsuite] Use -wrap and $gdb_test_name in gdb_test_multiple calls (2)

[gdb/testsuite] Use -wrap and $gdb_test_name in gdb_test_multiple calls (2)

Make gdb_test_multiple calls shorter by using new gdb_test_multiple variable
$gdb_test_name and new gdb_test_multiple pattern flag -wrap.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-10-25  Tom de Vries  <tdevries@suse.de>

	* gdb.reverse/sigall-precsave.exp: Use -wrap and $gdb_test_name in
	gdb_test_multiple calls.
	* gdb.reverse/sigall-reverse.exp: Same.
	* gdb.reverse/solib-precsave.exp: Same.
	* gdb.reverse/solib-reverse.exp: Same.
	* gdb.reverse/until-precsave.exp: Same.
	* gdb.reverse/until-reverse.exp: Same.

Change-Id: I67bb327d069dbc439410996bcfe6c7f905b2ca52