Use std::make_shared in LLDB (NFC)

Unlike std::make_unique, which is only available since C++14,
std::make_shared is available since C++11. Not only is std::make_shared
a lot more readable compared to ::reset(new), it also performs a single
heap allocation for the object and control block.

Differential revision: https://reviews.llvm.org/D57990

llvm-svn: 353764
diff --git a/lldb/source/API/SBTraceOptions.cpp b/lldb/source/API/SBTraceOptions.cpp
index a041f74..e48f1dc 100644
--- a/lldb/source/API/SBTraceOptions.cpp
+++ b/lldb/source/API/SBTraceOptions.cpp
@@ -13,11 +13,13 @@
 #include "lldb/Utility/Log.h"
 #include "lldb/Utility/TraceOptions.h"
 
+#include <memory>
+
 using namespace lldb;
 using namespace lldb_private;
 
 SBTraceOptions::SBTraceOptions() {
-  m_traceoptions_sp.reset(new TraceOptions());
+  m_traceoptions_sp = std::make_shared<TraceOptions>();
 }
 
 lldb::TraceType SBTraceOptions::getType() const {