[flang][cuda][NFC] Remove shared alloc addr space (#128535)

flang/lib/Optimizer/CodeGen/CodeGen.cpp

@@ -293,12 +293,6 @@ struct AllocaOpConversion : public fir::FIROpConversion<fir::AllocaOp> {
       rewriter.setInsertionPointAfter(size.getDefiningOp());
     }
 
-    if (auto dataAttr = alloc->getAttrOfType<cuf::DataAttributeAttr>(
-            cuf::getDataAttrName())) {
-      if (dataAttr.getValue() == cuf::DataAttribute::Shared)
-        allocaAs = 3;
-    }
-
     // NOTE: we used to pass alloc->getAttrs() in the builder for non opaque
     // pointers! Only propagate pinned and bindc_name to help debugging, but
     // this should have no functional purpose (and passing the operand segment