[wasm] Generate correct locations for error messages

src/messages.cc

 // Copyright 2011 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/messages.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/execution.h"
@@ skipping 655 matching lines @@
   builder.AppendCString("]+");
 
   Handle<Object> pos(Smi::FromInt(GetPosition()), isolate_);
   builder.AppendString(isolate_->factory()->NumberToString(pos));
   builder.AppendCString(")");
 
   return builder.Finish();
 }
 
 int WasmStackFrame::GetPosition() const {
+  // TODO(wasm): Clean this up (bug 5007).
   return (offset_ < 0) ? (-1 - offset_) : code_->SourcePosition(offset_);
 }
 
 Handle<Object> WasmStackFrame::Null() const {
   return isolate_->factory()->null_value();
 }
 
 Handle<Object> AsmJsWasmStackFrame::GetReceiver() const {
   return isolate_->global_proxy();
 }
@@ skipping 505 matching lines @@
   DCHECK(mode != SKIP_UNTIL_SEEN);
 
   Handle<Object> no_caller;
   Handle<String> msg = FormatMessage(isolate, template_index, arg0, arg1, arg2);
   return ErrorUtils::Construct(isolate, constructor, constructor, msg, mode,
                                no_caller, false);
 }
 
 }  // namespace internal
 }  // namespace v8