[wasm] Fix location for error in asm.js ToNumber conversion

src/wasm/module-decoder.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/wasm/module-decoder.h"
 
 #include "src/base/functional.h"
 #include "src/base/platform/platform.h"
 #include "src/flags.h"
 #include "src/macro-assembler.h"
@@ skipping 1186 matching lines @@
   Decoder decoder(tables_start, tables_end);
   uint32_t functions_count = decoder.consume_u32v("functions count");
   // Reserve space for the entries, taking care of invalid input.
   if (functions_count < static_cast<unsigned>(tables_end - tables_start)) {
     table.reserve(functions_count);
   }
 
   for (uint32_t i = 0; i < functions_count && decoder.ok(); ++i) {
     uint32_t size = decoder.consume_u32v("table size");
     if (size == 0) {
-      table.push_back(std::vector<std::pair<int, int>>());
+      table.push_back(std::vector<AsmJsOffsetEntry>());
       continue;
     }
     if (!decoder.checkAvailable(size)) {
       decoder.error("illegal asm function offset table size");
     }
     const byte* table_end = decoder.pc() + size;
     uint32_t locals_size = decoder.consume_u32("locals size");
     int last_byte_offset = locals_size;
     int last_asm_position = 0;
-    std::vector<std::pair<int, int>> func_asm_offsets;
+    std::vector<AsmJsOffsetEntry> func_asm_offsets;
     func_asm_offsets.reserve(size / 4);  // conservative estimation
     while (decoder.ok() && decoder.pc() < table_end) {
       last_byte_offset += decoder.consume_u32v("byte offset delta");
-      last_asm_position += decoder.consume_i32v("asm position delta");
-      func_asm_offsets.push_back({last_byte_offset, last_asm_position});
+      int call_position =
+          last_asm_position + decoder.consume_i32v("call position delta");
+      int to_number_position =
+          call_position + decoder.consume_i32v("to_number position delta");
+      last_asm_position = to_number_position;
+      func_asm_offsets.push_back(
+          {last_byte_offset, call_position, to_number_position});
     }
     if (decoder.pc() != table_end) {
       decoder.error("broken asm offset table");
     }
     table.push_back(std::move(func_asm_offsets));
   }
   if (decoder.more()) decoder.error("unexpected additional bytes");
 
   return decoder.toResult(std::move(table));
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8