Sizzle: POS selectors make more extensive use of tokenization. Fixes #12303.

http://jqbug.com/12303

diff --git a/src/sizzle b/src/sizzle
index 15e840c84e5870fa3fd9e7f0163f5cf70f0c97ac..af8206ff677909e61aec0158443ff74263e6265b 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 15e840c84e5870fa3fd9e7f0163f5cf70f0c97ac
+Subproject commit af8206ff677909e61aec0158443ff74263e6265b