Remove CHECK and don't free code/data in zygote space.

jvmti can redefine classes and request free-ing code generated
by the zygote. In this case, don't free the memory, as that would
actually lead to dirty memory, which is opposite the idea of
saving memory.

bug: 120653173
Test: com.android.server.wifi.test
Change-Id: I8552f075e68e6646f06842a8abf7ec65da6be292