PPC: Enable unaligned access and clean up the use of UNALIGNED_ACCESSES

src/ppc/assembler-ppc.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 859 matching lines @@
   void lhzx(Register dst, const MemOperand& src);
   void lhzux(Register dst, const MemOperand& src);
   void lha(Register dst, const MemOperand& src);
   void lhax(Register dst, const MemOperand& src);
   void lwz(Register dst, const MemOperand& src);
   void lwzu(Register dst, const MemOperand& src);
   void lwzx(Register dst, const MemOperand& src);
   void lwzux(Register dst, const MemOperand& src);
   void lwa(Register dst, const MemOperand& src);
   void lwax(Register dst, const MemOperand& src);
+  void ldbrx(Register dst, const MemOperand& src);
+  void lwbrx(Register dst, const MemOperand& src);
+  void lhbrx(Register dst, const MemOperand& src);
   void stb(Register dst, const MemOperand& src);
   void stbx(Register dst, const MemOperand& src);
   void stbux(Register dst, const MemOperand& src);
   void sth(Register dst, const MemOperand& src);
   void sthx(Register dst, const MemOperand& src);
   void sthux(Register dst, const MemOperand& src);
   void stw(Register dst, const MemOperand& src);
   void stwu(Register dst, const MemOperand& src);
   void stwx(Register rs, const MemOperand& src);
   void stwux(Register rs, const MemOperand& src);
@@ skipping 582 matching lines @@
 
 
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) { assembler->CheckBuffer(); }
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PPC_ASSEMBLER_PPC_H_