[Type checker] Drop unused parameter from coercePatternToType().

Author: DougGregor

lib/Sema/TypeCheckPattern.cpp

@@ -915,12 +915,7 @@ void repairTupleOrAssociatedValuePatternIfApplicable(
 /// Perform top-down type coercion on the given pattern.
 Pattern *TypeChecker::coercePatternToType(ContextualPattern pattern,
                                           Type type,
-                                          TypeResolutionOptions options,
-                                          TypeLoc tyLoc) {
-  if (tyLoc.isNull()) {
-    tyLoc = TypeLoc::withoutLoc(type);
-  }
-
+                                          TypeResolutionOptions options) {
   auto P = pattern.getPattern();
   auto dc = pattern.getDeclContext();
   auto &Context = dc->getASTContext();

lib/Sema/TypeChecker.h

@@ -959,8 +959,7 @@ class TypeChecker final {
   ///
   /// \returns the coerced pattern, or nullptr if the coercion failed.
   static Pattern *coercePatternToType(ContextualPattern pattern, Type type,
-                                      TypeResolutionOptions options,
-                                      TypeLoc tyLoc = TypeLoc());
+                                      TypeResolutionOptions options);
   static bool typeCheckExprPattern(ExprPattern *EP, DeclContext *DC,
                                    Type type);