Fixed doc-comments only binder to bind doc-comment always

compiler/frontend/src/org/jetbrains/jet/lang/parsing/CommentBinders.kt

@@ -58,14 +58,7 @@ object PrecedingDocCommentsBinder : WhitespacesAndCommentsBinder {
         if (tokens.isEmpty()) return 0
 
         for (idx in tokens.indices.reversed()) {
-            val tokenType = tokens[idx]
-            when (tokenType) {
-                JetTokens.DOC_COMMENT -> return idx
-
-                JetTokens.WHITE_SPACE -> continue
-
-                else ->  break
-            }
+            if (tokens[idx] == JetTokens.DOC_COMMENT) return idx
         }
 
         return tokens.size

compiler/testData/psi/DocCommentsBinding.kt

@@ -6,7 +6,7 @@ class A(
         /**
          * Doc comment for val-parameter
          */
-        val p: Int
+        /*var*/val p: Int
 ) {
     /**
      * Doc comment for function

compiler/testData/psi/DocCommentsBinding.txt

@@ -27,6 +27,7 @@ JetFile: DocCommentsBinding.kt
           PsiWhiteSpace('\n         ')
           PsiElement(KDOC_END)('*/')
         PsiWhiteSpace('\n        ')
+        PsiComment(BLOCK_COMMENT)('/*var*/')
         PsiElement(val)('val')
         PsiWhiteSpace(' ')
         PsiElement(IDENTIFIER)('p')