MIPS: Fix unaligned read/write operations in wasm.

src/wasm/encoder.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/signature.h"
 
 #include "src/handles.h"
 #include "src/v8.h"
 #include "src/zone-containers.h"
 
@@ skipping 12 matching lines @@
   indices in body */
 
 namespace {
 void EmitUint8(byte** b, uint8_t x) {
   Memory::uint8_at(*b) = x;
   *b += 1;
 }
 
 
 void EmitUint16(byte** b, uint16_t x) {
-  Memory::uint16_at(*b) = x;
+  WriteUnalignedUInt16(*b, x);
   *b += 2;
 }
 
 
 void EmitUint32(byte** b, uint32_t x) {
-  Memory::uint32_at(*b) = x;
+  WriteUnalignedUInt32(*b, x);
   *b += 4;
 }
 
 
 void EmitVarInt(byte** b, size_t val) {
   while (true) {
     size_t next = val >> 7;
     byte out = static_cast<byte>(val & 0x7f);
     if (next) {
       *((*b)++) = 0x80 | out;
@@ skipping 533 matching lines @@
       next = next | 0x80;
     }
     output.push_back(next);
     shift += 7;
   } while ((next & 0x80) != 0);
   return output;
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8