Fix a GCC warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135581 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index 50140d9..24d996c 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -240,8 +240,8 @@
     InsertPt = InsertBB->getTerminator();
   }
   assert(InsertPt && "Missing phi operand");
-  assert(!isa<Instruction>(Def) ||
-         DT->dominates(cast<Instruction>(Def), InsertPt) &&
+  assert((!isa<Instruction>(Def) ||
+          DT->dominates(cast<Instruction>(Def), InsertPt)) &&
          "def does not dominate all uses");
   return InsertPt;
 }