Use libdemangle for function names.

Bug: 62141808

Test: Ran unit tests, ran malloc debug with leaks and verified functions
Test: are demangled.
Change-Id: I1900632e9a55bb818b1aabc798224ff3eebc1fca
diff --git a/libc/malloc_debug/Android.bp b/libc/malloc_debug/Android.bp
index b071b90..06fc426 100644
--- a/libc/malloc_debug/Android.bp
+++ b/libc/malloc_debug/Android.bp
@@ -13,7 +13,7 @@
 
     stl: "libc++_static",
 
-    whole_static_libs: ["libasync_safe"],
+    whole_static_libs: ["libasync_safe", "libdemangle"],
 
     include_dirs: ["bionic/libc"],