Add intrinsics.type_equal_proc; Make map use an internal equal procedure to compare keys

core/intrinsics/intrinsics.odin

@@ -1,4 +1,5 @@
 // This is purely for documentation
+//+ignore
 package intrinsics
 
 // Types
@@ -152,3 +153,5 @@ type_polymorphic_record_parameter_value :: proc($T: typeid, index: int) -> $V --
 
 
 type_field_index_of :: proc($T: typeid, $name: string) -> uintptr ---
+
+type_equal_proc :: proc($T: typeid) -> (equal: proc "contextless" (rawptr, rawptr) -> bool) ---