Register SkipVectorize (apache#3228)

Author: gussmith23

src/api/api_pass.cc

@@ -130,6 +130,7 @@ REGISTER_PASS(RewriteUnsafeSelect);
 REGISTER_PASS(Inline);
 REGISTER_PASS(IRTransform);
 REGISTER_PASS(VectorizeLoop);
+REGISTER_PASS(SkipVectorize);
 REGISTER_PASS(UnrollLoop);
 REGISTER_PASS(InjectCopyIntrin);
 REGISTER_PASS(ThreadSync);