Revert accidental commit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181782 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index cacdf34..d187678 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -160,9 +160,7 @@
                                                    false);
   llvm::Value *Fn = CGF.CGM.CreateRuntimeFunction(FT, FnName);
 
-  llvm::CallInst *Call = CGF.EmitNounwindRuntimeCall(Fn, V, "abs");
-  Call->setDoesNotAccessMemory();
-  return Call;
+  return CGF.EmitNounwindRuntimeCall(Fn, V, "abs");
 }
 
 static RValue emitLibraryCall(CodeGenFunction &CGF, const FunctionDecl *Fn,