Implement malloc_info(3).

Expose jemalloc stats through the malloc_info(3) interface.

Bug: 16874689
Change-Id: I4358ac283002e60ff161107028d1a3fb1e9afb0a
diff --git a/libc/Android.mk b/libc/Android.mk
index 487cbd8..6beb7b3 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -135,6 +135,7 @@
     bionic/link.cpp \
     bionic/locale.cpp \
     bionic/lstat.cpp \
+    bionic/malloc_info.cpp \
     bionic/mbrtoc16.cpp \
     bionic/mbrtoc32.cpp \
     bionic/mbstate.cpp \