Implement sun.misc.Unsafe and fix the jfieldID/jmethodID leak.

Change-Id: I2997e19d9ae5e332a6731e7e10ebeff32bff085a
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 933fdf5..94b0fbc 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -119,6 +119,7 @@
 	src/stringprintf.cc \
 	src/stub_arm.cc \
 	src/stub_x86.cc \
+	src/sun_misc_Unsafe.cc \
 	src/thread.cc \
 	src/thread_list.cc \
 	src/utf.cc \