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

lldb/source/API/SBThreadPlan.cpp

@@ -41,6 +41,8 @@
 #include "lldb/API/SBThreadPlan.h"
 #include "lldb/API/SBValue.h"
 
+#include <memory>
+
 using namespace lldb;
 using namespace lldb_private;
 
@@ -58,7 +60,7 @@ SBThreadPlan::SBThreadPlan(const SBThreadPlan &rhs)
 SBThreadPlan::SBThreadPlan(lldb::SBThread &sb_thread, const char *class_name) {
   Thread *thread = sb_thread.get();
   if (thread)
-    m_opaque_sp.reset(new ThreadPlanPython(*thread, class_name));
+    m_opaque_sp = std::make_shared<ThreadPlanPython>(*thread, class_name);
 }
 
 //----------------------------------------------------------------------