Change std::sort to llvm::sort to detect non-determinism.

LLVM added wrappers to std::sort (r327219) that randomly shuffle the
container before sorting. The goal is to uncover non-determinism due to
undefined sorting order of objects having the same key.

This can be enabled with -DLLVM_ENABLE_EXPENSIVE_CHECKS=ON.

llvm-svn: 350679
diff --git a/lldb/source/Target/Target.cpp b/lldb/source/Target/Target.cpp
index 3ba5fc0..437f92a 100644
--- a/lldb/source/Target/Target.cpp
+++ b/lldb/source/Target/Target.cpp
@@ -764,7 +764,7 @@
   for (auto bp_name : m_breakpoint_names) {
     names.push_back(bp_name.first.AsCString());
   }
-  std::sort(names.begin(), names.end());
+  llvm::sort(names.begin(), names.end());
 }
 
 bool Target::ProcessIsValid() {