[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/exit_switch.h b/src/tint/lang/core/ir/exit_switch.h
new file mode 100644
index 0000000..f13d8d4
--- /dev/null
+++ b/src/tint/lang/core/ir/exit_switch.h
@@ -0,0 +1,53 @@
+// 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.
+
+#ifndef SRC_TINT_LANG_CORE_IR_EXIT_SWITCH_H_
+#define SRC_TINT_LANG_CORE_IR_EXIT_SWITCH_H_
+
+#include "src/tint/lang/core/ir/exit.h"
+#include "src/tint/utils/rtti/castable.h"
+
+// Forward declarations
+namespace tint::ir {
+class Switch;
+} // namespace tint::ir
+
+namespace tint::ir {
+
+/// A exit switch instruction.
+class ExitSwitch : public utils::Castable<ExitSwitch, Exit> {
+ public:
+ /// The base offset in Operands() for the args
+ static constexpr size_t kArgsOperandOffset = 0;
+
+ /// Constructor
+ /// @param sw the switch being exited
+ /// @param args the target MultiInBlock arguments
+ explicit ExitSwitch(ir::Switch* sw, utils::VectorRef<Value*> args = utils::Empty);
+ ~ExitSwitch() override;
+
+ /// Re-associates the exit with the given switch instruction
+ /// @param s the new switch to exit from
+ void SetSwitch(ir::Switch* s);
+
+ /// @returns the switch being exited
+ ir::Switch* Switch();
+
+ /// @returns the friendly name for the instruction
+ std::string_view FriendlyName() override { return "exit-switch"; }
+};
+
+} // namespace tint::ir
+
+#endif // SRC_TINT_LANG_CORE_IR_EXIT_SWITCH_H_
