stage2: Create cache manifest before calling final
If we enter the `if` because `comp.disable_c_depfile` is false the `man`
object has no manifest and calling .final on it will trip an assertion.
Closes #7096
0858d7b0dfLemonBoy committed on 12/1/2020, 11:52:52 PM· committed by Andrew Kelleyparenta4c8bd8