Don't allow direct access to StreamString's internal buffer.

This is a large API change that removes the two functions from
StreamString that return a std::string& and a const std::string&,
and instead provide one function which returns a StringRef.

Direct access to the underlying buffer violates the concept of
a "stream" which is intended to provide forward only access,
and makes porting to llvm::raw_ostream more difficult in the
future.

Differential Revision: https://reviews.llvm.org/D26698

llvm-svn: 287152

lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp

@@ -1566,7 +1566,7 @@ void RenderScriptRuntime::CaptureScriptInit(RuntimeHook *hook,
       script->type = ScriptDetails::eScriptC;
       script->cache_dir = cache_dir;
       script->res_name = res_name;
-      script->shared_lib = strm.GetData();
+      script->shared_lib = strm.GetString();
       script->context = addr_t(args[eRsContext]);
     }