[NFC] ConstrainSystem::getComputedBindings() is dead. Kill it.

(cherry picked from commit 87a5e4d)

Author: DougGregor

lib/Sema/CSSolver.cpp

@@ -1011,21 +1011,6 @@ static PotentialBindings getPotentialBindings(ConstraintSystem &cs,
   return result;
 }
 
-void ConstraintSystem::getComputedBindings(TypeVariableType *tvt,
-                                               SmallVectorImpl<Type> &bindings) {
-  // If the type variable is fixed, look no further.
-  if (auto fixedType = tvt->getImpl().getFixedType(nullptr)) {
-    bindings.push_back(fixedType);
-    return;
-  }
-  
-  PotentialBindings potentialBindings = getPotentialBindings(*this, tvt);
-  
-  for (auto binding : potentialBindings.Bindings) {
-    bindings.push_back(binding.BindingType);
-  }
-}
-
 /// \brief Try each of the given type variable bindings to find solutions
 /// to the given constraint system.
 ///

lib/Sema/ConstraintSystem.h

@@ -2070,11 +2070,6 @@ class ConstraintSystem {
   Expr *applySolutionShallow(const Solution &solution, Expr *expr,
                              bool suppressDiagnostics);
 
-  /// \brief Obtain the specializations computed for a type variable. This is
-  /// useful when emitting diagnostics for computed type variables.
-  void getComputedBindings(TypeVariableType *tvt,
-                           SmallVectorImpl<Type> &bindings);
-  
   /// Extract the base type from an array or slice type.
   /// \param type The array type to inspect.
   /// \returns the base type of the array.