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

Summary:
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 D44363 for a list of all the required patches.

Reviewers: sanjoy, dexonsmith, hfinkel, RKSimon

Reviewed By: dexonsmith

Subscribers: david2050, llvm-commits

Differential Revision: https://reviews.llvm.org/D44944

llvm-svn: 328925
diff --git a/llvm/lib/Analysis/CallGraph.cpp b/llvm/lib/Analysis/CallGraph.cpp
index ac3ea2b..ad410a3 100644
--- a/llvm/lib/Analysis/CallGraph.cpp
+++ b/llvm/lib/Analysis/CallGraph.cpp
@@ -96,8 +96,8 @@
   for (const auto &I : *this)
     Nodes.push_back(I.second.get());
 
-  std::sort(Nodes.begin(), Nodes.end(),
-            [](CallGraphNode *LHS, CallGraphNode *RHS) {
+  llvm::sort(Nodes.begin(), Nodes.end(),
+             [](CallGraphNode *LHS, CallGraphNode *RHS) {
     if (Function *LF = LHS->getFunction())
       if (Function *RF = RHS->getFunction())
         return LF->getName() < RF->getName();