[ScopInfo] Use MemoryAccess::getScopArrayInfo() interface to access Array [NFC]

By using the public interface MemoryAccess::getScopArrayInfo() we avoid the
direct access to the ScopArrayInfoMap and as a result also do not need to
use the BasePtr as key. This change makes the code cleaner.

The const-cast we introduce is a little ugly. We may consider to drop const
correctness for getScopArrayInfo() at some point.

This change removes unnecessary uses of MemoryAddress::getBaseAddr() in
preparation for https://reviews.llvm.org/D28518.

llvm-svn: 294655

polly/lib/Analysis/ScopInfo.cpp

@@ -3332,9 +3332,8 @@ void Scop::updateAccessDimensionality() {
       if (!Access->isArrayKind())
         continue;
       ScopArrayInfo *Array =
-          ScopArrayInfoMap[std::make_pair(Access->getBaseAddr(),
-                                          MemoryKind::Array)]
-              .get();
+          const_cast<ScopArrayInfo *>(Access->getScopArrayInfo());
+
       if (Array->getNumberOfDimensions() != 1)
         continue;
       unsigned DivisibleSize = Array->getElemSizeInBytes();