Frameworks/base: Compiled-classes support

Let AndroidRuntime check for /system/etc/compiled-classes and push
it to the runtime for boot image creation.

Bug: 18410571

(cherry picked from commit ca775941f3b7981aabf3a6a3b84d6c94f4f76aff)

Change-Id: I2510316381f2661166af24d7e14b013f4e045556
Lose some unnecessary JNI from the zygote.

Bug: 18719692
Change-Id: Ie2d50400f10f3c54cfbf94e54656f6d704eac267

Conflicts:
	core/java/com/android/internal/os/ZygoteConnection.java
	core/jni/com_android_internal_os_ZygoteInit.cpp