[wasm] Avoid crashing if parsing fails in asm -> wasm.

src/wasm/wasm-js.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/api.h"
 #include "src/api-natives.h"
 #include "src/assert-scope.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/factory.h"
@@ skipping 114 matching lines @@
   if (result.val) delete result.val;
 }
 
 
 v8::internal::wasm::WasmModuleIndex* TranslateAsmModule(i::ParseInfo* info) {
   info->set_global();
   info->set_lazy(false);
   info->set_allow_lazy_parsing(false);
   info->set_toplevel(true);
 
-  CHECK(i::Compiler::ParseAndAnalyze(info));
+  if (!i::Compiler::ParseAndAnalyze(info)) {
+    return nullptr;
+  }
+
   info->set_literal(
       info->scope()->declarations()->at(0)->AsFunctionDeclaration()->fun());
 
   v8::internal::AsmTyper typer(info->isolate(), info->zone(), *(info->script()),
                                info->literal());
   if (!typer.Validate()) {
     return nullptr;
   }
 
   auto module = v8::internal::wasm::AsmWasmBuilder(
@@ skipping 179 matching lines @@
   InstallFunc(isolate, wasm_object, "instantiateModule", InstantiateModule);
   InstallFunc(isolate, wasm_object, "verifyModule", VerifyModule);
   InstallFunc(isolate, wasm_object, "verifyFunction", VerifyFunction);
   InstallFunc(isolate, wasm_object, "compileRun", CompileRun);
   InstallFunc(isolate, wasm_object, "asmCompileRun", AsmCompileRun);
   InstallFunc(isolate, wasm_object, "instantiateModuleFromAsm",
               InstantiateModuleFromAsm);
 }
 }  // namespace internal
 }  // namespace v8