ARM64: small fixes for ArgumentAdaptorTrampoline after r20751.

src/arm64/builtins-arm64.cc

 // Copyright 2013 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 1397 matching lines @@
   //  -- x2 : expected number of arguments
   // -----------------------------------
   // Check the stack for overflow.
   // We are not trying to catch interruptions (e.g. debug break and
   // preemption) here, so the "real stack limit" is checked.
   Label enough_stack_space;
   __ LoadRoot(x10, Heap::kRealStackLimitRootIndex);
   // Make x10 the space we have left. The stack might already be overflowed
   // here which will cause x10 to become negative.
   __ Sub(x10, jssp, x10);
-  __ Mov(x11, jssp);
   // Check if the arguments will overflow the stack.
   __ Cmp(x10, Operand(x2, LSL, kPointerSizeLog2));
   __ B(le, stack_overflow);
 }
 
 
 static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
   __ SmiTag(x10, x0);
   __ Mov(x11, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
   __ Push(lr, fp);
@@ skipping 147 matching lines @@
 
   // Call the entry point without adapting the arguments.
   __ Bind(&dont_adapt_arguments);
   __ Jump(code_entry);
 
   __ Bind(&stack_overflow);
   {
     FrameScope frame(masm, StackFrame::MANUAL);
     EnterArgumentsAdaptorFrame(masm);
     __ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION);
-    __ Brk(0);
+    __ Unreachable();
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM