[DebugInfo] Change std::sort to llvm::sort in response to r327219

r327219 added wrappers to std::sort which randomly shuffle the container before
sorting.  This will help in uncovering non-determinism caused due to undefined
sorting order of objects having the same key.

To make use of that infrastructure we need to invoke llvm::sort instead of
std::sort.

Note: This patch is one of a series of patches to replace *all* std::sort to
llvm::sort.  Refer the comments section in D44363 for a list of all the
required patches.

llvm-svn: 330061

llvm/lib/DebugInfo/CodeView/DebugStringTableSubsection.cpp

@@ -91,7 +91,7 @@ std::vector<uint32_t> DebugStringTableSubsection::sortedIds() const {
   Result.reserve(IdToString.size());
   for (const auto &Entry : IdToString)
     Result.push_back(Entry.first);
-  std::sort(Result.begin(), Result.end());
+  llvm::sort(Result.begin(), Result.end());
   return Result;
 }