Replace OS::MemCopy with OS::MemMove (just as fast but more flexible).

src/ia32/assembler-ia32.cc

 // 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 2538 matching lines @@
 
   // Clear the buffer in debug mode. Use 'int3' instructions to make
   // sure to get into problems if we ever run uninitialized code.
 #ifdef DEBUG
   memset(desc.buffer, 0xCC, desc.buffer_size);
 #endif
 
   // Copy the data.
   int pc_delta = desc.buffer - buffer_;
   int rc_delta = (desc.buffer + desc.buffer_size) - (buffer_ + buffer_size_);
-  memmove(desc.buffer, buffer_, desc.instr_size);
-  memmove(rc_delta + reloc_info_writer.pos(),
-          reloc_info_writer.pos(), desc.reloc_size);
+  OS::MemMove(desc.buffer, buffer_, desc.instr_size);
+  OS::MemMove(rc_delta + reloc_info_writer.pos(),
+              reloc_info_writer.pos(), desc.reloc_size);
 
   // Switch buffers.
   if (isolate()->assembler_spare_buffer() == NULL &&
       buffer_size_ == kMinimalBufferSize) {
     isolate()->set_assembler_spare_buffer(buffer_);
   } else {
     DeleteArray(buffer_);
   }
   buffer_ = desc.buffer;
   buffer_size_ = desc.buffer_size;
@@ skipping 123 matching lines @@
     fprintf(coverage_log, "%s\n", file_line);
     fflush(coverage_log);
   }
 }
 
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32