Kill every call to @clang.arc.use in the ARC contract phase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177769 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/ObjCARC/DependencyAnalysis.cpp b/lib/Transforms/ObjCARC/DependencyAnalysis.cpp
index 5aada9c..8f917ae 100644
--- a/lib/Transforms/ObjCARC/DependencyAnalysis.cpp
+++ b/lib/Transforms/ObjCARC/DependencyAnalysis.cpp
@@ -38,6 +38,7 @@
   switch (Class) {
   case IC_Autorelease:
   case IC_AutoreleaseRV:
+  case IC_IntrinsicUser:
   case IC_User:
     // These operations never directly modify a reference count.
     return false;