PPC/s390: [builtins] Remove extra move in ResumeGeneratorTrampoline

Port dc7906c9

R=victorgomes@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: Ic6643492969efcf4113a25a886792038b291cacf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2876987Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74411}

src/builtins/ppc/builtins-ppc.cc

@@ -403,19 +403,16 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
       FieldMemOperand(r4, JSGeneratorObject::kParametersAndRegistersOffset));
   {
     Label done_loop, loop;
-    __ mr(r9, r6);
-
     __ bind(&loop);
-    __ subi(r9, r9, Operand(1));
-    __ cmpi(r9, Operand::Zero());
+    __ subi(r6, r6, Operand(1));
+    __ cmpi(r6, Operand::Zero());
     __ blt(&done_loop);
-    __ ShiftLeftImm(r10, r9, Operand(kTaggedSizeLog2));
+    __ ShiftLeftImm(r10, r6, Operand(kTaggedSizeLog2));
     __ add(scratch, r5, r10);
     __ LoadAnyTaggedField(scratch,
                           FieldMemOperand(scratch, FixedArray::kHeaderSize));
     __ Push(scratch);
     __ b(&loop);
-
     __ bind(&done_loop);
 
     // Push receiver.

src/builtins/s390/builtins-s390.cc

@@ -396,18 +396,15 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
       FieldMemOperand(r3, JSGeneratorObject::kParametersAndRegistersOffset));
   {
     Label done_loop, loop;
-    __ mov(r8, r5);
-
     __ bind(&loop);
-    __ SubS64(r8, r8, Operand(1));
+    __ SubS64(r5, r5, Operand(1));
     __ blt(&done_loop);
-    __ ShiftLeftU64(r1, r8, Operand(kTaggedSizeLog2));
+    __ ShiftLeftU64(r1, r5, Operand(kTaggedSizeLog2));
     __ la(scratch, MemOperand(r4, r1));
     __ LoadAnyTaggedField(scratch,
                           FieldMemOperand(scratch, FixedArray::kHeaderSize));
     __ Push(scratch);
     __ b(&loop);
-
     __ bind(&done_loop);
 
     // Push receiver.