clang-format: [JS] Support quoted object literal keys.

Before:
  var x = {
    a: a,
    b: b, 'c': c,
  };

After:
  var x = {
    a: a,
    b: b,
    'c': c,
  };

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@262291 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/TokenAnnotator.cpp

@@ -409,7 +409,8 @@ private:
                 (!Contexts.back().ColonIsDictLiteral ||
                  Style.Language != FormatStyle::LK_Cpp)) ||
                Style.Language == FormatStyle::LK_Proto) &&
-              Previous->Tok.getIdentifierInfo())
+              (Previous->Tok.getIdentifierInfo() ||
+               Previous->is(tok::char_constant)))
             Previous->Type = TT_SelectorName;
           if (CurrentToken->is(tok::colon) ||
               Style.Language == FormatStyle::LK_JavaScript)

unittests/Format/FormatTestJS.cpp

@@ -205,6 +205,13 @@ TEST_F(FormatTestJS, ContainerLiterals) {
   verifyFormat("f({a}, () => {\n"
                "  g();  //\n"
                "});");
+
+  // Keys can be quoted.
+  verifyFormat("var x = {\n"
+               "  a: a,\n"
+               "  b: b,\n"
+               "  'c': c,\n"
+               "};");
 }
 
 TEST_F(FormatTestJS, MethodsInObjectLiterals) {