Enable emplace_back for zone containers

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 1183 matching lines @@
   // Reserve space for the entries, taking care of invalid input.
   if (functions_count < static_cast<unsigned>(code_section.length()) / 2) {
     table.reserve(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)));
+    table.emplace_back(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));
 }
 
 AsmJsOffsetsResult DecodeAsmJsOffsets(const byte* tables_start,
                                       const byte* tables_end) {
   AsmJsOffsets table;
 
   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<AsmJsOffsetEntry>());
+      table.emplace_back();
       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_u32v("locals size");
     int function_start_position = decoder.consume_u32v("function start pos");
     int last_byte_offset = locals_size;
     int last_asm_position = function_start_position;
@@ skipping 18 matching lines @@
     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