Sema: Replace a couple of TypeChecker::getProtocol() calls with ASTContext::getProtocol()

Author: slavapestov

lib/Sema/CSSimplify.cpp

@@ -8857,8 +8857,7 @@ static CheckedCastKind getCheckedCastKind(ConstraintSystem *cs,
 static bool isCastToExpressibleByNilLiteral(ConstraintSystem &cs, Type fromType,
                                             Type toType) {
   auto &ctx = cs.getASTContext();
-  auto *nilLiteral = TypeChecker::getProtocol(
-      ctx, SourceLoc(), KnownProtocolKind::ExpressibleByNilLiteral);
+  auto *nilLiteral = ctx.getProtocol(KnownProtocolKind::ExpressibleByNilLiteral);
   if (!nilLiteral)
     return false;
 

lib/Sema/ConstraintSystem.cpp

@@ -2037,8 +2037,7 @@ TypeVariableType *ConstraintSystem::openGenericParameter(
   // been loaded because you've passed `-parse-stdlib` and are not building the
   // stdlib itself (which would have `-module-name Swift` too).
   if (!outerDC->getParentModule()->isBuiltinModule()) {
-    if (auto *copyable = TypeChecker::getProtocol(getASTContext(), SourceLoc(),
-                                                  KnownProtocolKind::Copyable)) {
+    if (auto *copyable = getASTContext().getProtocol(KnownProtocolKind::Copyable)) {
       addConstraint(
           ConstraintKind::ConformsTo, typeVar,
           copyable->getDeclaredInterfaceType(),

lib/Sema/TypeCheckProtocol.cpp

@@ -5823,8 +5823,7 @@ TypeChecker::containsProtocol(Type T, ProtocolDecl *Proto, ModuleDecl *M,
 bool TypeChecker::conformsToKnownProtocol(
     Type type, KnownProtocolKind protocol, ModuleDecl *module,
     bool allowMissing) {
-  if (auto *proto =
-          TypeChecker::getProtocol(module->getASTContext(), SourceLoc(), protocol))
+  if (auto *proto = module->getASTContext().getProtocol(protocol))
     return (bool) module->checkConformance(type, proto, allowMissing);
   return false;
 }