Use llvm::stable_sort

llvm-svn: 359098
diff --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index 0772dcc..4c0256f 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -459,7 +459,7 @@
       CharUnits BaseOffset = Layout.getBaseClassOffset(BD);
       Bases.push_back(BaseInfo(BD, BaseOffset, BaseNo));
     }
-    std::stable_sort(Bases.begin(), Bases.end());
+    llvm::stable_sort(Bases);
 
     for (unsigned I = 0, N = Bases.size(); I != N; ++I) {
       BaseInfo &Base = Bases[I];