Fix unaligned accesses in back_edge tables.

src/objects.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 10774 matching lines @@
     // If there is no back edge table, the "table start" will be at or after
     // (due to alignment) the end of the instruction stream.
     if (static_cast<int>(offset) < instruction_size()) {
       Address back_edge_cursor = instruction_start() + offset;
       uint32_t table_length = Memory::uint32_at(back_edge_cursor);
       PrintF(out, "Back edges (size = %u)\n", table_length);
       PrintF(out, "ast_id  pc_offset  loop_depth\n");
       for (uint32_t i = 0; i < table_length; ++i) {
         uint32_t ast_id = Memory::uint32_at(back_edge_cursor);
         uint32_t pc_offset = Memory::uint32_at(back_edge_cursor + kIntSize);
-        uint8_t loop_depth = Memory::uint8_at(back_edge_cursor + 2 * kIntSize);
+        uint32_t loop_depth = Memory::uint32_at(back_edge_cursor +
+                                                2 * kIntSize);
         PrintF(out, "%6u  %9u  %10u\n", ast_id, pc_offset, loop_depth);
         back_edge_cursor += FullCodeGenerator::kBackEdgeEntrySize;
       }
       PrintF(out, "\n");
     }
 #ifdef OBJECT_PRINT
     if (!type_feedback_info()->IsUndefined()) {
       TypeFeedbackInfo::cast(type_feedback_info())->TypeFeedbackInfoPrint(out);
       PrintF(out, "\n");
     }
@@ skipping 5149 matching lines @@
 
 void PropertyCell::AddDependentCode(Handle<Code> code) {
   Handle<DependentCode> codes = DependentCode::Insert(
       Handle<DependentCode>(dependent_code()),
       DependentCode::kPropertyCellChangedGroup, code);
   if (*codes != dependent_code()) set_dependent_code(*codes);
 }
 
 
 } }  // namespace v8::internal