Fix formatting of overloaded assignment operators.

Before: SomeType &operator=(const SomeType & S);
After:  SomeType &operator=(const SomeType &S);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179270 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 5b5f483..09fbce8 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -2374,6 +2374,7 @@
                "               const aaaaaaaaaaaaaaaaaaaaa &right) {\n"
                "  return left.group < right.group;\n"
                "}");
+  verifyFormat("SomeType &operator=(const SomeType &S);");
 
   verifyGoogleFormat("operator void*();");
   verifyGoogleFormat("operator SomeType<SomeType<int>>();");