[wasm] OOB traps: build protected instruction list during codegen

src/trap-handler/trap-handler.h

Index: src/trap-handler/trap-handler.h
diff --git a/src/trap-handler/trap-handler.h b/src/trap-handler/trap-handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..7c78b1f2320ad512b06ca0306aaa7f4ec7060e77
--- /dev/null
+++ b/src/trap-handler/trap-handler.h
@@ -0,0 +1,26 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_TRAP_HANDLER_H_
+#define V8_TRAP_HANDLER_H_
+
+namespace v8 {
+namespace internal {
+namespace trap_handler {
+
+struct ProtectedInstructionData {
+  // The offset of this instruction from the start of its code object.
+  int32_t instr_offset;
+
+  // The offset of the landing pad from the start of its code object.
+  //
+  // TODO(eholk): Using a single landing pad and store parameters here.
+  int32_t landing_offset;
+};
+
+}  // namespace trap_handler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_TRAP_HANDLER_H_