MIPS: Fix unaligned read/write operations in wasm.

test/cctest/wasm/wasm-run-utils.h

 // Copyright 2016 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.
 
 #ifndef WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 178 matching lines @@
       instance->function_table->set(i, Smi::FromInt(function->sig_index));
       instance->function_table->set(
           i + table_size, *instance->function_code->at(function_index));
     }
   }
 
 
  private:
   WasmModuleInstance instance_;
   uint32_t global_offset;
-  byte global_data[kMaxGlobalsSize];  // preallocated global data.
+  V8_ALIGNED(8) byte global_data[kMaxGlobalsSize];  // preallocated global data.
 
   WasmGlobal* AddGlobal(MachineType mem_type) {
     AllocModule();
     if (!module->globals) {
       module->globals = new std::vector<WasmGlobal>();
     }
     byte size = WasmOpcodes::MemSize(mem_type);
     global_offset = (global_offset + size - 1) & ~(size - 1);  // align
     module->globals->push_back({0, mem_type, global_offset, false});
     global_offset += size;
@@ skipping 197 matching lines @@
     if (p1 == MachineType::None()) return 1;
     if (p2 == MachineType::None()) return 2;
     if (p3 == MachineType::None()) return 3;
     return 4;
   }
 };
 
 }  // namespace
 
 #endif