[JSON] Use LLVM's library for encoding JSON in StructuredData

This patch replaces the hand-rolled JSON emission in StructuredData with
LLVM's JSON library.

Differential revision: https://reviews.llvm.org/D68248

llvm-svn: 373359

lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp

@@ -29,8 +29,8 @@
 using namespace lldb_private;
 using namespace lldb;
 
-void StructuredPythonObject::Dump(Stream &s, bool pretty_print) const {
-  s << "Python Obj: 0x" << GetValue();
+void StructuredPythonObject::Serialize(llvm::json::OStream &s) const {
+  s.value(llvm::formatv("Python Obj: {0:X}", GetValue()).str());
 }
 
 // PythonObject