[CodeCompletion] Skip conjunction elements unrelated to the code completion token

Author: ahoppen

lib/Sema/CSSyntacticElement.cpp

@@ -983,6 +983,10 @@ class SyntacticElementConstraintGenerator
         }
       }
 
+      if (cs.isForCodeCompletion() && !cs.containsCodeCompletionLoc(element)) {
+        continue;
+      }
+
       elements.push_back(
           makeElement(element,
                       cs.getConstraintLocator(