[mlir][drr] Use fully qualified name in getValueAndRangeUse (llvm#139847)

Author: jpienaar

mlir/lib/TableGen/Pattern.cpp

@@ -304,8 +304,8 @@ std::string SymbolInfoMap::SymbolInfo::getValueAndRangeUse(
     assert(index < 0);
     auto *operand = cast<NamedTypeConstraint *>(op->getArg(getArgIndex()));
     if (operand->isOptional()) {
-      auto repl =
-          formatv(fmt, formatv("({0}.empty() ? Value() : *{0}.begin())", name));
+      auto repl = formatv(
+          fmt, formatv("({0}.empty() ? ::mlir::Value() : *{0}.begin())", name));
       LLVM_DEBUG(dbgs() << repl << " (OptionalOperand)\n");
       return std::string(repl);
     }