Remove global semaphore and place in CheckerInfo

src/checker.hpp

@@ -293,6 +293,8 @@ struct CheckerInfo {
 	// NOTE(bill): If the semantic checker (check_proc_body) is to ever to be multithreaded,
 	// these variables will be of contention
 
+	gbSemaphore collect_semaphore;
+
 	// NOT recursive & Only used at the end of `check_proc_body`
 	// This is a possible source of contention but probably not
 	// too much of a problem in practice