Fix test-hashing after recent changes to string hashing.

src/mips/deoptimizer-mips.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 715 matching lines @@
   ASSERT(!(at.bit() & restored_regs));
   // Restore the registers from the last output frame.
   __ mov(at, a2);
   for (int i = kNumberOfRegisters - 1; i >= 0; i--) {
     int offset = (i * kPointerSize) + FrameDescription::registers_offset();
     if ((restored_regs & (1 << i)) != 0) {
       __ lw(ToRegister(i), MemOperand(at, offset));
     }
   }
 
-  // Set up the roots register.
-  ExternalReference roots_array_start =
-      ExternalReference::roots_array_start(isolate);
-  __ li(roots, Operand(roots_array_start));
+  __ InitializeRootRegister();
 
   __ pop(at);  // Get continuation, leave pc on stack.
   __ pop(ra);
   __ Jump(at);
   __ stop("Unreachable.");
 }
 
 
 void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
   Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm());
@@ skipping 20 matching lines @@
 
     ASSERT_EQ(table_entry_size_, masm()->pc_offset() - start);
   }
   __ bind(&done);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal