Fix formatting of multiplications in array subscripts.

Before:
a[a* a] = 1;

After:
a[a * a] = 1;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176180 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 87e89db..5be319c 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -1813,6 +1813,7 @@
   verifyIndependentOfContext("a * ++b;");
   verifyIndependentOfContext("a * --b;");
   verifyIndependentOfContext("a[4] * b;");
+  verifyIndependentOfContext("a[a * a] = 1;");
   verifyIndependentOfContext("f() * b;");
   verifyIndependentOfContext("a * [self dostuff];");
   verifyIndependentOfContext("a * (a + b);");