[RemoteMirrors] Add hook for resolving indirect addresses
Adds a hook so implementations of memory reader can add logic to
resolving remote addresses. This is needed because of an interaction
between LLDB, which tries to read memory from files instead of process
memory whenever possible and the DYLD shared cache.
The shared cache will merge pointers in the GOT sections from multiple
images into one location, and update the relative offsets to point to
the new location.
LLDB, will have initially read the offset pointing to the "old"
location, which will be zeroed out in live memory. This gives LLDB the
opportunity to re-read the relative offset, but from live memory, so it
can return the right pointer in the shared cache.
(cherry picked from commit 0f4a3ceb67a3669cd5433d5ae13fec6852876173)
rdar://163652093
