[wasm] Generate source position information

src/compiler/simplified-lowering.cc

 // Copyright 2014 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/compiler/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 287 matching lines @@
 
     // Run lowering and change insertion phase.
     TRACE("--{Simplified lowering phase}--\n");
     phase_ = LOWER;
     // Process nodes from the collected {nodes_} vector.
     for (NodeVector::iterator i = nodes_.begin(); i != nodes_.end(); ++i) {
       Node* node = *i;
       NodeInfo* info = GetInfo(node);
       TRACE(" visit #%d: %s\n", node->id(), node->op()->mnemonic());
       // Reuse {VisitNode()} so the representation rules are in one place.
-      SourcePositionTable::Scope scope(
-          source_positions_, source_positions_->GetSourcePosition(node));
+      SourcePositionScope scope(source_positions_,
+                                source_positions_->GetSourcePosition(node));
       VisitNode(node, info->truncation(), lowering);
     }
 
     // Perform the final replacements.
     for (NodeVector::iterator i = replacements_.begin();
          i != replacements_.end(); ++i) {
       Node* node = *i;
       Node* replacement = *(++i);
       node->ReplaceUses(replacement);
       // We also need to replace the node in the rest of the vector.
@@ skipping 1858 matching lines @@
   if (!rhs_type->Is(type_cache_.kZeroToThirtyOne)) {
     node->ReplaceInput(1, graph()->NewNode(machine()->Word32And(), rhs,
                                            jsgraph()->Int32Constant(0x1f)));
   }
   NodeProperties::ChangeOp(node, op);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8