Add backtrace_string and export to libmemunreachable
Add backtrace_string to convert a malloc_debug backtrace to a string.
Also move the backtrace functions to libc_malloc_debug_backtrace so that
libmemunreachable can reuse them.
Bug: 27208635
(cherry picked from commit 2c75991359df165ca7cc7a6213fb227c0b5ed87c)
Change-Id: Ia93aaf010fbce1ace058439427066ea2dfd8bd13
diff --git a/libc/private/libc_logging.h b/libc/private/libc_logging.h
index da2192b..e389565 100644
--- a/libc/private/libc_logging.h
+++ b/libc/private/libc_logging.h
@@ -101,6 +101,8 @@
__LIBC_HIDDEN__ int __libc_format_log_va_list(int priority, const char* tag, const char* format,
va_list ap);
+__LIBC_HIDDEN__ int __libc_write_log(int priority, const char* tag, const char* msg);
+
//
// Event logging.
//