[es6] Don't disable ES6 tail call elimination when Debugger is on.

src/arm64/builtins-arm64.cc

Index: src/arm64/builtins-arm64.cc
diff --git a/src/arm64/builtins-arm64.cc b/src/arm64/builtins-arm64.cc
index 85eda612bc2002e40d81b273f8a3e5aca9a1ec48..61b7e5fd780d902aa9a9bbbae5113ef92675052b 100644
--- a/src/arm64/builtins-arm64.cc
+++ b/src/arm64/builtins-arm64.cc
@@ -1977,15 +1977,6 @@ void PrepareForTailCall(MacroAssembler* masm, Register args_reg,
   DCHECK(!AreAliased(args_reg, scratch1, scratch2, scratch3));
   Comment cmnt(masm, "[ PrepareForTailCall");
 
-  // Prepare for tail call only if the debugger is not active.
-  Label done;
-  ExternalReference debug_is_active =
-      ExternalReference::debug_is_active_address(masm->isolate());
-  __ Mov(scratch1, Operand(debug_is_active));
-  __ Ldrb(scratch1, MemOperand(scratch1));
-  __ Cmp(scratch1, Operand(0));
-  __ B(ne, &done);
-
   // Drop possible interpreter handler/stub frame.
   {
     Label no_interpreter_frame;
@@ -2026,7 +2017,6 @@ void PrepareForTailCall(MacroAssembler* masm, Register args_reg,
   ParameterCount callee_args_count(args_reg);
   __ PrepareForTailCall(callee_args_count, caller_args_count_reg, scratch2,
                         scratch3);
-  __ bind(&done);
 }
 }  // namespace