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/Symbol/CompactUnwindInfo.cpp b/lldb/source/Symbol/CompactUnwindInfo.cpp
index 20987a0..f28bb36 100644
--- a/lldb/source/Symbol/CompactUnwindInfo.cpp
+++ b/lldb/source/Symbol/CompactUnwindInfo.cpp
@@ -17,10 +17,12 @@
 #include "lldb/Utility/DataBufferHeap.h"
 #include "lldb/Utility/Log.h"
 #include "lldb/Utility/StreamString.h"
-#include <algorithm>
 
 #include "llvm/Support/MathExtras.h"
 
+#include <algorithm>
+#include <memory>
+
 using namespace lldb;
 using namespace lldb_private;
 
@@ -263,8 +265,8 @@
       // have a live process and can read them out of memory.
       if (process_sp.get() == nullptr)
         return;
-      m_section_contents_if_encrypted.reset(
-          new DataBufferHeap(m_section_sp->GetByteSize(), 0));
+      m_section_contents_if_encrypted =
+          std::make_shared<DataBufferHeap>(m_section_sp->GetByteSize(), 0);
       Status error;
       if (process_sp->ReadMemory(
               m_section_sp->GetLoadBaseAddress(&process_sp->GetTarget()),