Backport hash collision workaround to 3.6.

src/arm/builtins-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 988 matching lines @@
 
   // Clear the context before we push it when entering the JS frame.
   __ mov(cp, Operand(0, RelocInfo::NONE));
 
   // Enter an internal frame.
   __ EnterInternalFrame();
 
   // Set up the context from the function argument.
   __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
 
-  // Set up the roots register.
-  ExternalReference roots_address =
-      ExternalReference::roots_address(masm->isolate());
-  __ mov(r10, Operand(roots_address));
+  __ InitializeRootRegister();
 
   // Push the function and the receiver onto the stack.
   __ push(r1);
   __ push(r2);
 
   // Copy arguments to the stack in a loop.
   // r1: function
   // r3: argc
   // r4: argv, i.e. points to first arg
   Label loop, entry;
@@ skipping 663 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(r3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM