add "test-int128" and "test-bitops" to .gitignore

"test-int128" was probably missed in commit 6046c62
("int128: optimize and add test cases").

"test-bitops" was probably missed in commit 3464700
("tests: Add test-bitops.c with some sextract tests").

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

.gitignore

@@ -45,7 +45,9 @@ qemu-bridge-helper
 qemu-monitor.texi
 vscclient
 QMP/qmp-commands.txt
+test-bitops
 test-coroutine
+test-int128
 test-qmp-input-visitor
 test-qmp-output-visitor
 test-string-input-visitor