[shuffle] Move ir/ to new structure.
This CL moves the `ir/` folder to `lang/core/ir/`. The build
targets and namespaces are not updated as part of the move and will be
fixed up in later CLs.
Bug: tint:1988
Change-Id: If504287783adf47fe415f304ce91b2644d31bcd1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/142780
Reviewed-by: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
diff --git a/src/tint/lang/core/ir/unreachable.cc b/src/tint/lang/core/ir/unreachable.cc
new file mode 100644
index 0000000..158d77f
--- /dev/null
+++ b/src/tint/lang/core/ir/unreachable.cc
@@ -0,0 +1,23 @@
+// Copyright 2023 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/tint/lang/core/ir/unreachable.h"
+
+TINT_INSTANTIATE_TYPEINFO(tint::ir::Unreachable);
+
+namespace tint::ir {
+
+Unreachable::~Unreachable() = default;
+
+} // namespace tint::ir
