[wasm] sundry trap handler fixes

src/wasm/wasm-module.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 <memory>
 
 #include "src/assembler-inl.h"
 #include "src/base/adapters.h"
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
@@ skipping 1298 matching lines @@
     //--------------------------------------------------------------------------
     {
       for (int i = 0; i < code_table->length(); ++i) {
         Handle<Code> code = code_table->GetValueChecked<Code>(isolate_, i);
 
         if (code->kind() != Code::WASM_FUNCTION) {
           continue;
         }
 
         FixedArray* protected_instructions = code->protected_instructions();
-
+        DCHECK(protected_instructions != nullptr);
         Zone zone(isolate_->allocator(), "Wasm Module");
         ZoneVector<trap_handler::ProtectedInstructionData> unpacked(&zone);
         for (int i = 0; i < protected_instructions->length();
              i += Code::kTrapDataSize) {
           trap_handler::ProtectedInstructionData data;
           data.instr_offset =
               protected_instructions
                   ->GetValueChecked<Smi>(isolate_, i + Code::kTrapCodeOffset)
                   ->value();
           data.landing_offset =
@@ skipping 968 matching lines @@
   CHECK(!compiled_module->has_weak_owning_instance());
 }
 
 void testing::ValidateOrphanedInstance(Isolate* isolate,
                                        Handle<WasmInstanceObject> instance) {
   DisallowHeapAllocation no_gc;
   WasmCompiledModule* compiled_module = instance->compiled_module();
   CHECK(compiled_module->has_weak_wasm_module());
   CHECK(compiled_module->ptr_to_weak_wasm_module()->cleared());
 }