Fix the duplication in the debugging code.

We had two copies of the backtrace code, and two copies of the
libcorkscrew /proc/pid/maps code. This patch gets us down to one.

We also had hacks so we could log in the malloc debugging code.
This patch pulls the non-allocating "printf" code out of the
dynamic linker so everyone can share.

This patch also makes the leak diagnostics easier to read, and
makes it possible to paste them directly into the 'stack' tool (by
using relative PCs).

This patch also fixes the stdio standard stream leak that was
causing a leak warning every time tf_daemon ran.

Bug: 7291287
Change-Id: I66e4083ac2c5606c8d2737cb45c8ac8a32c7cfe8

libc/bionic/malloc_debug_leak.cpp

@@ -45,6 +45,7 @@
 #include <unistd.h>
 #include <unwind.h>
 
+#include "debug_stacktrace.h"
 #include "dlmalloc.h"
 #include "logd.h"
 #include "malloc_debug_common.h"
@@ -255,8 +256,6 @@ extern "C" void* fill_memalign(size_t alignment, size_t bytes) {
 
 static void* MEMALIGN_GUARD = reinterpret_cast<void*>(0xA1A41520);
 
-extern __LIBC_HIDDEN__ int get_backtrace(intptr_t* addrs, size_t max_entries);
-
 extern "C" void* leak_malloc(size_t bytes) {
     // allocate enough space infront of the allocation to store the pointer for
     // the alloc structure. This will making free'ing the structer really fast!