Resolve typedefs in HashMap gdb/lldb pretty-printers

Resolve typedefs in HashMap gdb/lldb pretty-printers

`GetTypedefedType` (LLDB) and `strip_typedefs` (GDB) calls are needed to resolve key and value types completely.
Without these calls, debugger doesn't show the actual type.

* Before (without `GetTypedefedType`):
(lldb) frame variable hm[0]
(T) hm[0] = { ... }

* After (with `GetTypedefedType`):
(lldb) frame variable hm[0]
((i32, alloc::string::String)) hm[0] = { ... }