clang-format: Operator precendence in ObjC method exprs.

Patch (mostly) by Adam Strzelecki. Thanks!

Before:
  [self aaaaaa:bbbbbbbbbbbbb
      aaaaaaaaaa:bbbbbbbbbbbbbbbbb
           aaaaa:bbbbbbbbbbb +
      bbbbbbbbbbbb aaaa:bbb];

After:
  [self aaaaaa:bbbbbbbbbbbbb
      aaaaaaaaaa:bbbbbbbbbbbbbbbbb
           aaaaa:bbbbbbbbbbb + bbbbbbbbbbbb
            aaaa:bbb];

This fixes llvm.org/PR16150.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187631 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/TokenAnnotator.cpp b/lib/Format/TokenAnnotator.cpp
index af80650..e46a700 100644
--- a/lib/Format/TokenAnnotator.cpp
+++ b/lib/Format/TokenAnnotator.cpp
@@ -863,6 +863,11 @@
           CurrentPrecedence = 1;
         else if (Current->Type == TT_BinaryOperator || Current->is(tok::comma))
           CurrentPrecedence = 1 + (int)Current->getPrecedence();
+        else if (Current->Type == TT_ObjCSelectorName) {
+          CurrentPrecedence = 1 + (int)prec::Assignment;
+          if (Precedence == CurrentPrecedence)
+            Start = Current;
+        }
       }
 
       // At the end of the line or when an operator with higher precedence is