Functions have unique names now unless they are foreign, probably will

need a keyword to not mangle the names.

core_ast.cpp

@@ -264,6 +264,7 @@ enum Ast_Decl_State{
 struct Ast_Decl: Ast{
   Ast_Decl_State state;
   Intern_String name;
+  Intern_String unique_name; // For code generation
 
   Ast_Scope *scope;
   Ast_Expr *typespec;