Revert of PPC/s390: [debugger] remove debugger statement support from FCG/CS.

src/s390/macro-assembler-s390.cc

Index: src/s390/macro-assembler-s390.cc
diff --git a/src/s390/macro-assembler-s390.cc b/src/s390/macro-assembler-s390.cc
index 93a85c4ff6cee5435c4a6b0890b51198d618efbc..fa1dc2c06d6e88b7f83e5f614b1647857605a1cc 100644
--- a/src/s390/macro-assembler-s390.cc
+++ b/src/s390/macro-assembler-s390.cc
@@ -1462,6 +1462,15 @@
   bgt(fail);
 }
 
+void MacroAssembler::DebugBreak() {
+  LoadImmP(r2, Operand::Zero());
+  mov(r3,
+      Operand(ExternalReference(Runtime::kHandleDebuggerStatement, isolate())));
+  CEntryStub ces(isolate(), 1);
+  DCHECK(AllowThisStubCall(&ces));
+  Call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT);
+}
+
 void MacroAssembler::MaybeDropFrames() {
   // Check whether we need to drop frames to restart a function on the stack.
   ExternalReference restart_fp =