Let the map function compute the relative pc.

The new packed relocations linker option creates an elf with a non-zero
load base. It's no longer an easy task to compute the relative pc yourself
so call the helper function to do it for us.

Bug: 20687795

(cherry picked from commit 332ef327c2b1a5e1774ba0d1da23e07303002af9)

Change-Id: I3d61c767f21a3f240a14f9e8bc6bee53b6cdb60d
1 file changed