Fix unaligned accesses in back_edge tables.

src/full-codegen.h

 // Copyright 2012 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 118 matching lines @@
 #elif V8_TARGET_ARCH_X64
   static const int kCodeSizeMultiplier = 162;
 #elif V8_TARGET_ARCH_ARM
   static const int kCodeSizeMultiplier = 142;
 #elif V8_TARGET_ARCH_MIPS
   static const int kCodeSizeMultiplier = 142;
 #else
 #error Unsupported target architecture.
 #endif
 
-  static const int kBackEdgeEntrySize = 2 * kIntSize + kOneByteSize;
+  static const int kBackEdgeEntrySize = 3 * kIntSize;
 
  private:
   class Breakable;
   class Iteration;
 
   class TestContext;
 
   class NestedStatement BASE_EMBEDDED {
    public:
     explicit NestedStatement(FullCodeGenerator* codegen) : codegen_(codegen) {
@@ skipping 491 matching lines @@
   Handle<FixedArray> handler_table() { return handler_table_; }
 
   struct BailoutEntry {
     BailoutId id;
     unsigned pc_and_state;
   };
 
   struct BackEdgeEntry {
     BailoutId id;
     unsigned pc;
-    uint8_t loop_depth;
+    uint32_t loop_depth;
   };
 
   struct TypeFeedbackCellEntry {
     TypeFeedbackId ast_id;
     Handle<Cell> cell;
   };
 
 
   class ExpressionContext BASE_EMBEDDED {
    public:
@@ skipping 216 matching lines @@
   }
 
  private:
   Zone* zone_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_