clang-format: Fix regression introduced by r189353.

Before:
  FirstToken->WhitespaceRange.getBegin()
      .getLocWithOffset(First->LastNewlineOffset);

After:
  FirstToken->WhitespaceRange.getBegin().getLocWithOffset(
      First->LastNewlineOffset);

Re-add logic to prevent breaking after an empty set of parentheses.
Basically it seems that calling a function without parameters is more
like navigating along the same object than it is a separate step of a
builder-type call.

We might need to extends this in future to allow "short" parameters that
e.g. are an index accessing a specific element.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190126 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/Format.cpp

@@ -520,7 +520,7 @@ private:
         LBrace.Children.size() == 0)
       // The previous token does not open a block. Nothing to do. We don't
       // assert so that we can simply call this function for all tokens.
-      return true; 
+      return true;
 
     if (NewLine) {
       unsigned ParentIndent = State.Stack.back().Indent;
@@ -624,7 +624,7 @@ private:
           ++FormatTok->NewlinesBefore;
           // FIXME: This is technically incorrect, as it could also
           // be a literal backslash at the end of the line.
-          if (i == 0 || FormatTok->TokenText[i-1] != '\\')
+          if (i == 0 || FormatTok->TokenText[i - 1] != '\\')
             FormatTok->HasUnescapedNewline = true;
           FormatTok->LastNewlineOffset = WhitespaceLength + i + 1;
           Column = 0;

lib/Format/TokenAnnotator.cpp

@@ -1137,7 +1137,8 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
     return 2;
 
   if (Right.isMemberAccess()) {
-    if (Left.isOneOf(tok::r_paren, tok::r_square))
+    if (Left.isOneOf(tok::r_paren, tok::r_square) && Left.MatchingParen &&
+        Left.MatchingParen->ParameterCount > 0)
       return 20; // Should be smaller than breaking at a nested comma.
     return 150;
   }

unittests/Format/FormatTest.cpp

@@ -2970,6 +2970,10 @@ TEST_F(FormatTest, FormatsBuilderPattern) {
   verifyFormat("aaaaaaaaaaaaa->aaaaaaaaaaaaaaaaaaaaaaaa()\n"
                "    ->aaaaaaaaaaaaaae(0)\n"
                "    ->aaaaaaaaaaaaaaa();");
+
+  // Prefer not to break after empty parentheses.
+  verifyFormat("FirstToken->WhitespaceRange.getBegin().getLocWithOffset(\n"
+               "    First->LastNewlineOffset);");
 }
 
 TEST_F(FormatTest, BreaksAccordingToOperatorPrecedence) {