Properly initialize desc->origin in the ARM assembler.

src/arm/assembler-arm.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 527 matching lines @@
   // Emit constant pool if necessary.
   CheckConstPool(true, false);
   ASSERT(num_pending_32_bit_reloc_info_ == 0);
   ASSERT(num_pending_64_bit_reloc_info_ == 0);
 
   // Set up code descriptor.
   desc->buffer = buffer_;
   desc->buffer_size = buffer_size_;
   desc->instr_size = pc_offset();
   desc->reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos();
+  desc->origin = this;
 }
 
 
 void Assembler::Align(int m) {
   ASSERT(m >= 4 && IsPowerOf2(m));
   while ((pc_offset() & (m - 1)) != 0) {
     nop();
   }
 }
 
@@ skipping 2928 matching lines @@
 
   // Since a constant pool was just emitted, move the check offset forward by
   // the standard interval.
   next_buffer_check_ = pc_offset() + kCheckPoolInterval;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM