Fix build error by fully qualifying llvm::make_unique.

llvm-svn: 251338
diff --git a/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp b/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
index 57e24c9..303b6d4 100644
--- a/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
+++ b/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
@@ -545,7 +545,7 @@
   if (!Context)
     Context.reset(new DWARFContextInMemory(*Objects.second));
   assert(Context);
-  auto Info = make_unique<ModuleInfo>(Objects.first, std::move(Context));
+  auto Info = llvm::make_unique<ModuleInfo>(Objects.first, std::move(Context));
   ModuleInfo *Res = Info.get();
   Modules.emplace(ModuleName, std::move(Info));
   return Res;