[wasm] Introduce the TrapIf and TrapUnless operators to generate trap code.

src/wasm/wasm-opcodes.cc

 // Copyright 2015 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.
 
 #include "src/wasm/wasm-opcodes.h"
 #include "src/messages.h"
+#include "src/runtime/runtime.h"
 #include "src/signature.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
 typedef Signature<LocalType> FunctionSig;
 
 const char* WasmOpcodes::OpcodeName(WasmOpcode opcode) {
   switch (opcode) {
@@ skipping 151 matching lines @@
 #define TRAPREASON_TO_MESSAGE(name) \
   case k##name:                     \
     return MessageTemplate::kWasm##name;
     FOREACH_WASM_TRAPREASON(TRAPREASON_TO_MESSAGE)
 #undef TRAPREASON_TO_MESSAGE
     default:
       return MessageTemplate::kNone;
   }
 }
 
+int32_t WasmOpcodes::TrapReasonToFunctionId(TrapReason reason) {
+  switch (reason) {
+#define TRAPREASON_TO_MESSAGE(name) \
+  case k##name:                     \
+    return static_cast<int32_t>(Runtime::kThrowWasm##name);
+    FOREACH_WASM_TRAPREASON(TRAPREASON_TO_MESSAGE)
+#undef TRAPREASON_TO_MESSAGE
+    default:
+      UNREACHABLE();
+      return -1;
+  }
+}
+
 const char* WasmOpcodes::TrapReasonMessage(TrapReason reason) {
   return MessageTemplate::TemplateString(TrapReasonToMessageId(reason));
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8