Revert "[PGO][ICP] Prevent indirect call promotion to functions with incompatible target features" (#208079)
Reverts llvm/llvm-project#192142
Now that https://github.com/llvm/llvm-project/pull/205113 has landed, we
will not inline functions with incompatible target features, even if the
callee is marked `alwaysinline`, so we can promote calls to such
functions while also removing the extra complexity from ICP.