[Packetizer] Add AliasAnalysis as a parameter to the packetizer

This will make the depedence graph more accurate if an alias analysis
is provided. If nullptr is specified in its place, the behavior will
remain as it is currently.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255540 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed