Handle attributes in printf legalization

VCPrintfStringVariable attribute must be moved to cloned GV during
printf legalization as now this variable is used in printf the original
variable is no longer used in printf.

Author: dmitryryintel

IGC/VectorCompiler/lib/GenXOpts/CMTrans/GenXPrintfLegalization.cpp

@@ -175,6 +175,16 @@ static GlobalVariable &cloneString(GlobalVariable &OrigGV) {
   // Avoiding constants merging.
   OrigGV.setUnnamedAddr(GlobalValue::UnnamedAddr::None);
   ClonedGV->setAlignment(IGCLLVM::getAlign(OrigGV));
+
+  // Handle attributes.
+  IGC_ASSERT_MESSAGE(
+      OrigGV.hasAttribute(PrintfStringVariable),
+      "original GV must already have the attribute before the cloning");
+  auto OrigAttrs = OrigGV.getAttributes();
+  OrigAttrs =
+      OrigAttrs.removeAttribute(OrigGV.getContext(), PrintfStringVariable);
+  OrigGV.setAttributes(OrigAttrs);
+  ClonedGV->addAttribute(PrintfStringVariable);
   return *ClonedGV;
 }