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

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index fa73120e7fea53c5eda92300d8f3a1f432a982e4..7aa04857507b6f79cd0102f173afc9765b7a6e80 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -1566,6 +1566,15 @@
 }
 
 
+void MacroAssembler::DebugBreak() {
+  li(r3, Operand::Zero());
+  mov(r4,
+      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 =