Clean up ExceptionOccurred.

Use ExceptionCheck before ExceptionOccurred since ExceptionCheck
doesn't acquire any locks and is faster.

Change-Id: Ibd87fd1e33b339bd2a6effa1d20d3253c8a61bdc

Conflicts:
	core/jni/android_util_Binder.cpp

Conflicts:
	core/jni/android_util_Binder.cpp