[SCEV] Ensure SCEV does not replace aliases with their aliasees

Passes in general shouldn't replace an alias with the aliasee (see
https://reviews.llvm.org/D66606). This can lead to situations where a
linkonce_odr symbol (which could be interposable if lowered to weak
linkage) can be replaced with a local aliasee which won't be
interposable. SVEC does this when the function is invoked by
FunctionPass Manager -> Loop Pass Manager -> Induction Variable Users in
the codegen pipeline. This was found in hwasan instrumented code where a
linonce_odr alias was replaced with its private aliasee.

This fixes the bug descriped at
https://github.com/llvm/llvm-project/issues/60668.

Differential Revision: https://reviews.llvm.org/D144035