[debugger] remove debugger statement support from FCG/CS.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index efb2d3c9da34fc8e9d8206823f0d56e889c35bdb..e5091af030573513071fdaf79f52a6c5b4afc9b4 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -4089,15 +4089,6 @@ void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) {
 }
 
 
-void MacroAssembler::DebugBreak() {
-  Set(rax, 0);  // No arguments.
-  LoadAddress(rbx,
-              ExternalReference(Runtime::kHandleDebuggerStatement, isolate()));
-  CEntryStub ces(isolate(), 1);
-  DCHECK(AllowThisStubCall(&ces));
-  Call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT);
-}
-
 void MacroAssembler::PrepareForTailCall(const ParameterCount& callee_args_count,
                                         Register caller_args_count_reg,
                                         Register scratch0, Register scratch1,