[DAE] Don't DAE if we musttail call a "live" (non-DAE-able) function

There are 2 such base cases: indirect calls and calls to functions external
to the module; and then any musttail calls to live functions (because of
the first 2 reasons or otherwise).

The IR validator reports, in these cases, that it "cannot guarantee tail
call due to mismatched parameter counts".

The fix is two-fold: first, we mark as "live" (i.e. non-DAE-able)
functions that make an indirect musttail call.

Then, we propagate live-ness to musttail callers of live functions.

Declared functions are already marked "live".

Differential Revision: https://reviews.llvm.org/D145209