Rollup merge of #55802 - wesleywiser:inlined_calls_2_electric_boogaloo, r=nagisa

Don't inline virtual calls (take 2)

When I fixed the previous mis-optimizations, I didn't realize there were
actually two different places where we mutate `callsites` and both of
them should have the same behavior.

As a result, if a function was inlined and that function contained
virtual function calls, they were incorrectly being inlined. I also
added a test case which covers this.