Utility methods for artificial debug types in the generated DWARF (#1482)

* add operator*
* add operator->
* add ptr() unwrap method
* comments/refactor
* macro_rules
* external symbols workaround

crates/runtime/src/lib.rs

@@ -33,6 +33,7 @@ mod trap_registry;
 mod traphandlers;
 mod vmcontext;
 
+pub mod debug_builtins;
 pub mod libcalls;
 
 pub use crate::export::*;