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/DataFormatters/StringPrinter.cpp

@@ -20,6 +20,7 @@
 
 #include <ctype.h>
 #include <locale>
+#include <memory>
 
 using namespace lldb;
 using namespace lldb_private;
@@ -306,7 +307,8 @@ static bool DumpUTFBufferToStream(
     llvm::UTF8 *utf8_data_end_ptr = nullptr;
 
     if (ConvertFunction) {
-      utf8_data_buffer_sp.reset(new DataBufferHeap(4 * bufferSPSize, 0));
+      utf8_data_buffer_sp =
+          std::make_shared<DataBufferHeap>(4 * bufferSPSize, 0);
       utf8_data_ptr = (llvm::UTF8 *)utf8_data_buffer_sp->GetBytes();
       utf8_data_end_ptr = utf8_data_ptr + utf8_data_buffer_sp->GetByteSize();
       ConvertFunction(&data_ptr, data_end_ptr, &utf8_data_ptr,