Move map data into backtrace data proper.

The backtrace structure used to include a pointer to a backtrace_map_t
that represented the map data for a particular pc. This introduced a
race condition where the pointer could be discarded, but the backtrace
structure still contained a pointer to garbage memory. Now all of the map
information is right in the structure.

Bug: 19028453
Change-Id: If7088a73f3c6bf1f3bc8cdd2bb4b62e7cab831c0
diff --git a/libbacktrace/BacktraceImpl.h b/libbacktrace/BacktraceImpl.h
index d34ad05..cd61bdf 100755
--- a/libbacktrace/BacktraceImpl.h
+++ b/libbacktrace/BacktraceImpl.h
@@ -37,8 +37,8 @@
   inline pid_t Pid() { return backtrace_obj_->Pid(); }
   inline pid_t Tid() { return backtrace_obj_->Tid(); }
 
-  inline const backtrace_map_t* FindMap(uintptr_t addr) {
-    return backtrace_obj_->FindMap(addr);
+  inline void FillInMap(uintptr_t addr, backtrace_map_t* map) {
+    backtrace_obj_->FillInMap(addr, map);
   }
   inline std::string GetFunctionName(uintptr_t pc, uintptr_t* offset) {
     return backtrace_obj_->GetFunctionName(pc, offset);