Use libunwindbacktrace for debug malloc code.

Create a method of disabling the debug allocation code paths so that
it's possible to use the libunwindbacktrace library without any
modifications.

Use this path to create and destroy the maps for the process. It's not
stricly necessary in the init code since the symbols are not modified
until after the initialize calls.

Also, remove the debug_XXX source files that doesn't need to be in libc.so.

Fix the maps reading code since it was completely broken for 64 bit.

Bug: 16408686

Change-Id: I6b02ef6ce26fdb7a59ad1029e7cbba9accceb704
diff --git a/libc/bionic/debug_mapinfo.h b/libc/bionic/debug_mapinfo.h
index cccd2e3..926b377 100644
--- a/libc/bionic/debug_mapinfo.h
+++ b/libc/bionic/debug_mapinfo.h
@@ -33,8 +33,8 @@
 
 struct mapinfo_t {
   struct mapinfo_t* next;
-  unsigned start;
-  unsigned end;
+  uintptr_t start;
+  uintptr_t end;
   char name[];
 };