Silence warning about && in ||.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166391 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Option.cpp b/lib/Driver/Option.cpp
index 116dbca..e9440c5 100644
--- a/lib/Driver/Option.cpp
+++ b/lib/Driver/Option.cpp
@@ -23,7 +23,7 @@
   // Multi-level aliases are not supported, and alias options cannot
   // have groups. This just simplifies option tracking, it is not an
   // inherent limitation.
-  assert(!Info || (!getAlias().isValid() || (!getAlias().getAlias().isValid() &&
+  assert((!Info || !getAlias().isValid() || (!getAlias().getAlias().isValid() &&
          !getGroup().isValid())) &&
          "Multi-level aliases and aliases with groups are unsupported.");
 }