Remove dead mutex

src/checker.cpp

@@ -865,7 +865,6 @@ void init_checker_info(CheckerInfo *i) {
 	gb_mutex_init(&i->lazy_mutex);
 
 	mutex_init(&i->type_info_mutex);
-	mutex_init(&i->scope_mutex);
 	mutex_init(&i->deps_mutex);
 	mutex_init(&i->identifier_uses_mutex);
 	mutex_init(&i->foreign_mutex);
@@ -897,7 +896,6 @@ void destroy_checker_info(CheckerInfo *i) {
 	gb_mutex_destroy(&i->gen_types_mutex);
 	gb_mutex_destroy(&i->lazy_mutex);
 	mutex_destroy(&i->type_info_mutex);
-	mutex_destroy(&i->scope_mutex);
 	mutex_destroy(&i->deps_mutex);
 	mutex_destroy(&i->identifier_uses_mutex);
 	mutex_destroy(&i->foreign_mutex);

src/checker.hpp

@@ -293,8 +293,6 @@ struct CheckerInfo {
 	// NOTE(bill): If the semantic checker (check_proc_body) is to ever to be multithreaded,
 	// these variables will be of contention
 
-	BlockingMutex scope_mutex;
-
 	// 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