[mlir] Fix passArg of ViewOpGraphPass

[jpienaar]

D'oh thanks

mlir/include/mlir/Transforms/Passes.td

let description = [{
     ```
 
     See [Symbols and SymbolTables](SymbolsAndSymbolTables.md) for more
     information on `Symbols`.
   }];
   let constructor = "mlir::createSymbolDCEPass()";
 }
 
-def ViewOpGraphPass : Pass<"symbol-dce", "ModuleOp"> {
+def ViewOpGraphPass : Pass<"view-op-graph", "ModuleOp"> {
   let summary = "Print graphviz view of module";
   let description = [{
     This pass prints a graphviz per block of a module.
 
     - Op are represented as nodes;
     - Uses as edges;
   }];
   let constructor = "mlir::createPrintOpGraphPass()";