Fix copying of cached map data.
Fix copying of cached map data.

When I added the new ability to read from memory, I didn't fix one
of the pointers in the map data when doing a copy.

Bug: 24352206
Change-Id: Iebef8436aa664ee066e83ab7a9953838aee56bc0

SyndicateRogue/libunwind,SyndicateRogue/libunwind,SyndicateRogue/libunwind