Fix test-hashing after recent changes to string hashing.

src/arm/deoptimizer-arm.cc

 // Copyright 2011 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 705 matching lines @@
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
     __ ldr(r6, MemOperand(r2, offset));
     __ push(r6);
   }
 
   // Restore the registers from the stack.
   __ ldm(ia_w, sp, restored_regs);  // all but pc registers.
   __ pop(ip);  // remove sp
   __ pop(ip);  // remove lr
 
-  // Set up the roots register.
-  ExternalReference roots_array_start =
-      ExternalReference::roots_array_start(isolate);
-  __ mov(r10, Operand(roots_array_start));
+  __ InitializeRootRegister();
 
   __ pop(ip);  // remove pc
   __ pop(r7);  // get continuation, leave pc on stack
   __ pop(lr);
   __ Jump(r7);
   __ stop("Unreachable.");
 }
 
 
 void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
@@ skipping 13 matching lines @@
     __ push(ip);
     __ b(&done);
     ASSERT(masm()->pc_offset() - start == table_entry_size_);
   }
   __ bind(&done);
 }
 
 #undef __
 
 } }  // namespace v8::internal