clang-format: [JS] Fix regex literal detection.

Before:
  var regex = /= / ;

After:
  var regex = /=/;

llvm-svn: 236811
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index 43fc4b4..0d37caf 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -463,6 +463,7 @@
 }
 
 TEST_F(FormatTestJS, RegexLiteralSpecialCharacters) {
+  verifyFormat("var regex = /=/;");
   verifyFormat("var regex = /a*/;");
   verifyFormat("var regex = /a+/;");
   verifyFormat("var regex = /a?/;");