[ScopInfo] Expect the OriginalBaseAddr when looking at underlying instructions [NFC]
During SCoP construction we sometimes inspect the underlying IR by looking at
the base address of a MemoryAccess. In such cases, we always want the original
base address. Make this clear by calling getOriginalBaseAddr().
This is a non-functional change as getBaseAddr maps to getOriginalBaseAddr
at the moment.
This change removes unnecessary uses of MemoryAddress::getBaseAddr() in
preparation for https://reviews.llvm.org/D28518.
git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@294576 91177308-0d34-0410-b5e6-96231b3b80d8