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

Revert of PPC/s390: [debugger] remove debugger statement support from FCG/CS. (patchset #1 id:1 of https://codereview.chromium.org/2672813002/ )

Reason for revert:
Original CL got reverted https://codereview.chromium.org/2672823007

Original issue's description:
> PPC/s390: [debugger] remove debugger statement support from FCG/CS.
>
> Port eef855a1
>
> R=yangguo@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
> BUG=
> LOG=N
>
> Review-Url: https://codereview.chromium.org/2672813002
> Cr-Commit-Position: refs/heads/master@{#42898}
> Committed: https://chromium.googlesource.com/v8/v8/+/f2d2ebcae8f31a7787778c429018156a432662e2

TBR=joransiu@ca.ibm.com,jyan@ca.ibm.com,michael_dawson@ca.ibm.com,yangguo@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Review-Url: https://codereview.chromium.org/2677183003
Cr-Commit-Position: refs/heads/master@{#42972}

src/ppc/macro-assembler-ppc.cc

@@ -1567,6 +1567,15 @@ void MacroAssembler::IsObjectNameType(Register object, Register scratch,
 }
 
 
+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 =

src/ppc/macro-assembler-ppc.h

@@ -635,10 +635,13 @@ class MacroAssembler : public Assembler {
 
   void IsObjectNameType(Register object, Register scratch, Label* fail);
 
+  // ---------------------------------------------------------------------------
+  // Debugger Support
+
   void DebugBreak();
-  // Frame restart support
   void MaybeDropFrames();
 
+  // ---------------------------------------------------------------------------
   // Exception handling
 
   // Push a new stack handler and link into stack handler chain.

src/s390/macro-assembler-s390.cc

@@ -1463,6 +1463,15 @@ void MacroAssembler::IsObjectNameType(Register object, Register scratch,
   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 =

src/s390/macro-assembler-s390.h

@@ -946,9 +946,13 @@ class MacroAssembler : public Assembler {
 
   void IsObjectNameType(Register object, Register scratch, Label* fail);
 
-  // Frame restart support
+  // ---------------------------------------------------------------------------
+  // Debugger Support
+
+  void DebugBreak();
   void MaybeDropFrames();
 
+  // ---------------------------------------------------------------------------
   // Exception handling
 
   // Push a new stack handler and link into stack handler chain.