[PATCH] Use read_memory_unsigned_integer when reading to CORE_ADDR

[Andrew Cagney]

> I used extract_type_address to honor the comment about not causing a memory_error.
> 
> I'll check in the change from builtin_type_void_data_ptr to builtin_type_void_code_ptr.

Thanks!

> Unless someone objects, I'll also change
> 
>   int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
> 
> to
> 
>   int ptrbytes = TYPE_LENGTH (builtin_type_void_code_ptr);

Now this I like so much, I'm going to add it to the ARI as a recommendation.

Andrew