Fix expression recognition in for-loops.

Before: for (; a&& b;) {}
After:  for (; a && b;) {}

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181017 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 055b9d1..abb2b58 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -2547,6 +2547,7 @@
   verifyIndependentOfContext("A<int **, int **> a;");
   verifyIndependentOfContext("void f(int *a = d * e, int *b = c * d);");
   verifyFormat("for (char **a = b; *a; ++a) {\n}");
+  verifyFormat("for (; a && b;) {\n}");
 
   verifyFormat(
       "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"