[ConstraintSystem] NFC: Add hasFix() to DisjunctionChoice

Author: xedin

lib/Sema/ConstraintSystem.cpp

@@ -2525,10 +2525,9 @@ void ConstraintSystem::generateConstraints(
   }
 
   for (auto index : indices(choices)) {
-    const auto &choice = choices[index];
     if (favoredIndex && (*favoredIndex == index))
       continue;
 
-    recordChoice(constraints, index, choice);
+    recordChoice(constraints, index, choices[index]);
   }
 }

lib/Sema/ConstraintSystem.h

@@ -2474,7 +2474,7 @@ class ConstraintSystem {
   /// \param requiresFix Determines whether choices require a fix to
   /// be included in the result. If the fix couldn't be provided by
   /// `getFix` for any given choice, such choice would be filtered out.
-  ////
+  ///
   /// \param getFix Optional callback to determine a fix for a given
   /// choice (first argument is a position of current choice,
   /// second - the choice in question).
@@ -3678,6 +3678,10 @@ class DisjunctionChoice {
 
   bool isDisabled() const { return Choice->isDisabled(); }
 
+  bool hasFix() const {
+    return bool(Choice->getFix());
+  }
+
   bool isUnavailable() const {
     if (auto *decl = getDecl(Choice))
       return decl->getAttrs().isUnavailable(decl->getASTContext());