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

src/ppc/macro-assembler-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 1548 matching lines @@
 
 void MacroAssembler::IsObjectNameType(Register object, Register scratch,
                                       Label* fail) {
   LoadP(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
   lbz(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
   cmpi(scratch, Operand(LAST_NAME_TYPE));
   bgt(fail);
 }
 
 
+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 =
       ExternalReference::debug_restart_fp_address(isolate());
   mov(r4, Operand(restart_fp));
   LoadWordArith(r4, MemOperand(r4));
   cmpi(r4, Operand::Zero());
   Jump(isolate()->builtins()->FrameDropperTrampoline(), RelocInfo::CODE_TARGET,
        ne);
 }
@@ skipping 2806 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC