When breaking at function calls, indent from function name.

Otherwise (when indenting from the wrapped -> or .), this looks
like a confusing indent.

Before:
aaaaaaa        //
    .aaaaaaa( //
        aaaaaaa);
After:
aaaaaaa        //
    .aaaaaaa( //
         aaaaaaa);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181595 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/Format.cpp

@@ -496,6 +496,8 @@ private:
       }
 
       State.Stack.back().LastSpace = State.Column;
+      if (Current.isOneOf(tok::arrow, tok::period))
+        State.Stack.back().LastSpace += Current.FormatTok.TokenLength;
       State.StartOfLineLevel = State.ParenLevel;
 
       // Any break on this level means that the parent level has been broken
@@ -599,7 +601,8 @@ private:
     if (Current.isOneOf(tok::period, tok::arrow) &&
         Line.Type == LT_BuilderTypeCall && State.ParenLevel == 0)
       State.Stack.back().StartOfFunctionCall =
-          Current.LastInChainOfCalls ? 0 : State.Column;
+          Current.LastInChainOfCalls ? 0 : State.Column +
+                                               Current.FormatTok.TokenLength;
     if (Current.Type == TT_CtorInitializerColon) {
       State.Stack.back().Indent = State.Column + 2;
       if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine)