[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/ScalarEvolutionExpander.cpp b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
index 78a22e3..e2113d1 100644
--- a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -1862,7 +1862,7 @@
     Phis.push_back(&PN);
 
   if (TTI)
-    std::sort(Phis.begin(), Phis.end(), [](Value *LHS, Value *RHS) {
+    llvm::sort(Phis.begin(), Phis.end(), [](Value *LHS, Value *RHS) {
       // Put pointers at the back and make sure pointer < pointer = false.
       if (!LHS->getType()->isIntegerTy() || !RHS->getType()->isIntegerTy())
         return RHS->getType()->isIntegerTy() && !LHS->getType()->isIntegerTy();