[JSON][NFC] Support print and dump methods in json::Value (#129302)

Author: npanchen

llvm/include/llvm/Support/JSON.h

@@ -472,6 +472,14 @@ class Value {
     return LLVM_LIKELY(Type == T_Array) ? &as<json::Array>() : nullptr;
   }
 
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+  void print(llvm::raw_ostream &OS) const;
+  LLVM_DUMP_METHOD void dump() const {
+    print(llvm::dbgs());
+    llvm::dbgs() << '\n';
+  }
+#endif // !NDEBUG || LLVM_ENABLE_DUMP
+
 private:
   void destroy();
   void copyFrom(const Value &M);

llvm/lib/Support/JSON.cpp

@@ -182,6 +182,10 @@ void Value::destroy() {
   }
 }
 
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+void Value::print(llvm::raw_ostream &OS) const { OS << *this; }
+#endif // !NDEBUG || LLVM_ENABLE_DUMP
+
 bool operator==(const Value &L, const Value &R) {
   if (L.kind() != R.kind())
     return false;