[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 be42ab1421aa367c772cc422e1f4714b056ff374..c31c30a2cc0036ae3e2bdfe5ddd32f5fc70a6125 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -4071,11 +4071,6 @@ void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) {
   }
 }
 
-void MacroAssembler::DebugBreak() {
-  Call(isolate()->builtins()->HandleDebuggerStatement(),
-       RelocInfo::DEBUGGER_STATEMENT);
-}
-
 void MacroAssembler::MaybeDropFrames() {
   // Check whether we need to drop frames to restart a function on the stack.
   ExternalReference restart_fp =