[wasm] [asmjs] Route asm.js warnings to the dev console.

src/asmjs/asm-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/asmjs/asm-js.h"
 
 #include "src/api-natives.h"
 #include "src/api.h"
 #include "src/asmjs/asm-typer.h"
 #include "src/asmjs/asm-wasm-builder.h"
@@ skipping 142 matching lines @@
 
 MaybeHandle<FixedArray> AsmJs::ConvertAsmToWasm(ParseInfo* info) {
   ErrorThrower thrower(info->isolate(), "Asm.js -> WebAssembly conversion");
   wasm::AsmWasmBuilder builder(info->isolate(), info->zone(),
                                info->ast_value_factory(), info->script(),
                                info->literal());
   Handle<FixedArray> foreign_globals;
   auto asm_wasm_result = builder.Run(&foreign_globals);
   if (!asm_wasm_result.success) {
     DCHECK(!info->isolate()->has_pending_exception());
-    PrintF("Validation of asm.js module failed: %s\n",
-           builder.typer()->error_message());
+    MessageHandler::ReportMessage(info->isolate(),
+                                  builder.typer()->message_location(),
+                                  builder.typer()->error_message());
     return MaybeHandle<FixedArray>();
   }
   wasm::ZoneBuffer* module = asm_wasm_result.module_bytes;
   wasm::ZoneBuffer* asm_offsets = asm_wasm_result.asm_offset_table;
 
   MaybeHandle<JSObject> compiled = wasm::CreateModuleObjectFromBytes(
       info->isolate(), module->begin(), module->end(), &thrower,
       internal::wasm::kAsmJsOrigin, info->script(), asm_offsets->begin(),
       asm_offsets->end());
   DCHECK(!compiled.is_null());
@@ skipping 81 matching lines @@
       i::Object::GetProperty(module_object, single_function_name);
   if (!single_function.is_null() &&
       !single_function.ToHandleChecked()->IsUndefined(isolate)) {
     return single_function;
   }
   return module_object;
 }
 
 }  // namespace internal
 }  // namespace v8