[CSSolver] Remove tuple-to-tuple narrow perf hack

Don't try to short-circuit disjunctions if one of the choices
produced tuple-to-tuple conversion since that doesn't mean
that there are no other choices out there.

Author: xedin

lib/Sema/CSSolver.cpp

@@ -1725,7 +1725,7 @@ static bool shortCircuitDisjunctionAt(Constraint *constraint,
 
     return true;
   }
-  
+
   // Anything without a fix is better than anything with a fix.
   if (constraint->getFix() && !successfulConstraint->getFix())
     return true;
@@ -1991,13 +1991,6 @@ bool ConstraintSystem::solveSimplified(
       }
 
       lastSolvedChoice = {currentChoice, *score};
-
-      // If we see a tuple-to-tuple conversion that succeeded, we're done.
-      // FIXME: This should be more general.
-      if (auto restriction = currentChoice->getRestriction()) {
-        if (*restriction == ConversionRestrictionKind::TupleToTuple)
-          break;
-      }
     }
 
     if (TC.getLangOpts().DebugConstraintSolver) {