[pseudo] Add a print-grammar option in the tool

[hokein]

Summary

This is helpful for debugging purposes.

clang/tools/clang-pseudo/ClangPseudo.cpp

 
 using clang::syntax::pseudo::Grammar;
 using llvm::cl::desc;
 using llvm::cl::init;
 using llvm::cl::opt;
 
 static opt<std::string>
     Grammar("grammar", desc("Parse and check a BNF grammar file."), init(""));
+static opt<bool> PrintGrammar("print-grammar", desc("Print the grammar."));
 static opt<bool> PrintGraph("print-graph",
                             desc("Print the LR graph for the grammar"));
 static opt<bool> PrintTable("print-table",
                             desc("Print the LR table for the grammar"));
 static opt<std::string> Source("source", desc("Source file"));
 static opt<bool> PrintSource("print-source", desc("Print token stream"));
 static opt<bool> PrintTokens("print-tokens", desc("Print detailed token info"));
 static opt<bool>
if (Grammar.getNumOccurrences()) {
     auto G = Grammar::parseBNF(Text, Diags);
 
     if (!Diags.empty()) {
       llvm::errs() << llvm::join(Diags, "\n");
       return 2;
     }
     llvm::outs() << llvm::formatv("grammar file {0} is parsed successfully\n",
                                   Grammar);
+    if (PrintGrammar)
+      llvm::outs() << G->dump();
     if (PrintGraph)
       llvm::outs() << clang::syntax::pseudo::LRGraph::buildLR0(*G).dumpForTests(
           *G);
     if (PrintTable)
       llvm::outs() << clang::syntax::pseudo::LRTable::buildSLR(*G).dumpForTests(
           *G);
     return 0;
   }