[wasm] Remove three fields from wasm object

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/macro-assembler.h"
 #include "src/objects.h"
@@ skipping 1086 matching lines @@
 
   // Reserve entries for the imported functions.
   table.reserve(num_imported_functions);
   for (uint32_t i = 0; i < num_imported_functions; i++) {
     table.push_back(std::make_pair(0, 0));
   }
 
   uint32_t functions_count = decoder.consume_u32v("functions count");
   // Take care of invalid input here.
   if (functions_count < static_cast<unsigned>(code_section.length()) / 2)
-    table.reserve(functions_count);
+    table.reserve(num_imported_functions + functions_count);
   int section_offset = static_cast<int>(code_section.start() - module_start);
   DCHECK_LE(0, section_offset);
   for (uint32_t i = 0; i < functions_count && decoder.ok(); ++i) {
     uint32_t size = decoder.consume_u32v("body size");
     int offset = static_cast<int>(section_offset + decoder.pc_offset());
     table.push_back(std::make_pair(offset, static_cast<int>(size)));
     DCHECK(table.back().first >= 0 && table.back().second >= 0);
     decoder.consume_bytes(size);
   }
   if (decoder.more()) decoder.error("unexpected additional bytes");
 
   return decoder.toResult(std::move(table));
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8