Not sure the distinction between call.ll and call-indirect.ll,
because call.ll also seems to contain many call_indirect tests. Also
before D147033 call-indirect.ll only contained a single test and it
also tests it with obj2yaml, so I guess that file was created for
testing functionalities for object files as well.
We can probably merge these two someday. But anyway, this moves
call_indirect_alloca I added in D147033 to call.ll, given that that
file contains more call_indirect tests and I'm planning to add more
call_indirect tests in a followup CL.