Move StructuredData from Core to Utility

Summary:
It had a dependency on StringConvert and file reading code, which is not
in Utility. I've replaced that code by equivalent llvm operations.

I've added a unit test to demonstrate that parsing a file still works.

Reviewers: zturner, jingham

Subscribers: kubamracek, mgorny, lldb-commits

Differential Revision: https://reviews.llvm.org/D34625

llvm-svn: 306394
diff --git a/lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.h b/lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.h
index 27caf42..1a5b60a 100644
--- a/lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.h
+++ b/lldb/source/Plugins/Process/gdb-remote/ThreadGDBRemote.h
@@ -16,9 +16,9 @@
 
 // Other libraries and framework includes
 // Project includes
-#include "lldb/Core/StructuredData.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/Thread.h"
+#include "lldb/Utility/StructuredData.h"
 
 class StringExtractor;