Fix font-lock of successive identifiers

Example:

```swift
enum Foo: Error {
  .foo
}
```

`Foo` was not fontified with `swift-mode:function-name-face`.

Author: taku0

swift-mode-font-lock.el

@@ -361,8 +361,8 @@ The predicate MATCH-P is called with two arguments:
   (let ((result nil))
     (while (and
             (< (point) limit)
-            (re-search-forward "\\<\\(\\sw\\|\\s_\\)+\\>" limit t)
-            (not result))
+            (not result)
+            (re-search-forward "\\<\\(\\sw\\|\\s_\\)+\\>" limit t))
       (when (save-excursion
               (save-match-data
                 (funcall match-p (match-beginning 0) limit)))

test/swift-files/font-lock/font-lock.swift

@@ -30,11 +30,11 @@ foo != bar // "foo != bar"
 
 foo !== bar // "foo !== bar"
 
-a.b.c! // #("a.b.c!" 4 5 (face swift-mode:property-access-face))
+a.b.c! // #("a.b.c!" 2 3 (face swift-mode:property-access-face) 4 5 (face swift-mode:property-access-face))
 
-a.b.c_! // #("a.b.c_!" 4 5 (face swift-mode:property-access-face))
+a.b.c_! // #("a.b.c_!" 2 3 (face swift-mode:property-access-face) 4 5 (face swift-mode:property-access-face))
 
-a.b.aあ! // #("a.b.a\343\201\202!" 4 8 (face swift-mode:property-access-face))
+a.b.aあ! // #("a.b.a\343\201\202!" 2 3 (face swift-mode:property-access-face) 4 8 (face swift-mode:property-access-face))
 
 init! {} // #("init! {}" 0 4 (face swift-mode:keyword-face))
 
@@ -45,7 +45,13 @@ let x = foo()! // #("let x = foo()!" 0 3 (face swift-mode:keyword-face) 8 11 (fa
 let x = foo[0]! // #("let x = foo[0]!" 0 3 (face swift-mode:keyword-face))
 
 // Identifiers can be quoted.
-a.b.`c`! // #("a.b.`c`!" 4 7 (face font-lock-string-face))
+a.b.`c`! // #("a.b.`c`!" 2 3 (face swift-mode:property-access-face) 4 7 (face font-lock-string-face))
 
 // Custom operators.
 foo +!+!+!+!+ bbb // "foo +!+!+!+!+ bbb"
+
+//
+// Regression tests.
+//
+
+enum Foo: Error { .foo } // #("enum Foo: Error { .foo }" 0 4 (face swift-mode:keyword-face) 5 8 (face swift-mode:function-name-face) 10 15 (face swift-mode:builtin-type-face) 19 22 (face swift-mode:property-access-face))