Prefix entrypoints with 0xFF so we can do extra checks.

Add check to ensure we do not read method header from libart.so

Bug: 123510633
Test: m -j40 cts && cts-tradefed run cts \
  --test android.jvmti.cts.JvmtiHostTest1927#testJvmti \
  --module CtsJvmtiRunTest1927HostTestCases
Change-Id: Ic3e42e3bd4fbda3b11c7e265ed114770139151b9
8 files changed