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

src/wasm/wasm-opcodes.cc

Index: src/wasm/wasm-opcodes.cc
diff --git a/src/wasm/wasm-opcodes.cc b/src/wasm/wasm-opcodes.cc
index 8f81b81a50bd9c4eb54c8952a354c227532a644d..658c3b8c929d803db94d3e395bac0e44667059dc 100644
--- a/src/wasm/wasm-opcodes.cc
+++ b/src/wasm/wasm-opcodes.cc
@@ -4,6 +4,7 @@
 
 #include "src/wasm/wasm-opcodes.h"
 #include "src/messages.h"
+#include "src/runtime/runtime.h"
 #include "src/signature.h"
 
 namespace v8 {
@@ -175,6 +176,19 @@ int WasmOpcodes::TrapReasonToMessageId(TrapReason reason) {
   }
 }
 
+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));
 }