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

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index 7c6cd91b5acdec2e548427b9e20112628e711d23..e1fb9b0a5ec6c66a57c85c5e63c3a7bc88b0b150 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -943,6 +943,10 @@ class ExternalReference BASE_EMBEDDED {
   static ExternalReference f64_asin_wrapper_function(Isolate* isolate);
   static ExternalReference f64_mod_wrapper_function(Isolate* isolate);
 
+  // Trap callback function for cctest/wasm/wasm-run-utils.h
+  static ExternalReference wasm_call_trap_callback_for_testing(
+      Isolate* isolate);
+
   // Log support.
   static ExternalReference log_enter_external_function(Isolate* isolate);
   static ExternalReference log_leave_external_function(Isolate* isolate);