See JDK-8055008 and the fix for jdk8u
http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/c9b7abadf150

The change added "_running_emcp" bit field to Method class. As a result, however, we are using total 9 bits of bit-fields.

We need to keep the Method flags in one byte. Otherwise you will see the increased memory usage (i.e. 1~4 bytes increased per Method)