64-bit Addresses in remote protocol

[Joel Sherrill]

Hi

Over at RTEMS, we are looking at some warnings in our debug
server and wondering if fields described as "addr" in the gdb
protocol should be treated 64-bits when that target has 64-bit
addresses like the aarch64.

Technically, we are looking at sweeping through our gdb server
and using  uintptr_t for addresses where uint32_t has been
ok before.

But I wanted to make sure that our assumption that "addr" means
a valid target address which means it can be 32- or 64- bits based
on the target.

Thanks.

--joel
RTEMS