Add support for non-zero vaddr in maps.

If a map has a non-zero vaddr then it needs to be added to the
computed relative offset.

Bug: 22532054
Change-Id: If55015165d25ecc4b530f674b481c8c7ef760a23
diff --git a/libc/bionic/debug_mapinfo.h b/libc/bionic/debug_mapinfo.h
index 926b377..af7d05d 100644
--- a/libc/bionic/debug_mapinfo.h
+++ b/libc/bionic/debug_mapinfo.h
@@ -35,6 +35,9 @@
   struct mapinfo_t* next;
   uintptr_t start;
   uintptr_t end;
+  uintptr_t offset;
+  uintptr_t load_base;
+  bool load_base_read;
   char name[];
 };