Bug: http://b/116873221
If not, Clang assumes that the TU which defines this function will
contain the vtable for the class as well. Since there's no out-of-line
definition of this funciton, no TU ends up with the vtable.
This causes a problem with coverage builds, which are built with -O0,
where calls don't get inlined, thereby requiring a definition of the
vtable. For non -O0 builds, the vtable is not required since the
virtual calls get inlined/optimized-out.
Test: Build with and without -O0.
Change-Id: I60a5cefcd1c327f1e00785fedbb2163c682b33d1
459afe96d1