PPC/s390: [deoptimizer] Remove non-fixed-size deopts

Port 0a110021

Original Commit Message:

    All architectures have kSupportsFixedDeoptExitSizes = true, so we can
    remove kSupportsFixedDeoptExitSizes entirely and always have fixed-size
    deopts.

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

Change-Id: If33d936ea59e6add15b835793637fc50f28d07fd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3557254Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79657}

src/builtins/ppc/builtins-ppc.cc

@@ -3277,17 +3277,16 @@ void Generate_DeoptimizationEntry(MacroAssembler* masm,
   const int kSavedRegistersAreaSize =
       (kNumberOfRegisters * kSystemPointerSize) + kDoubleRegsSize;
 
-  __ mov(r5, Operand(Deoptimizer::kFixedExitSizeMarker));
   // Get the address of the location in the code object (r6) (return
   // address for lazy deoptimization) and compute the fp-to-sp delta in
   // register r7.
-  __ mflr(r6);
-  __ addi(r7, sp, Operand(kSavedRegistersAreaSize));
-  __ sub(r7, fp, r7);
+  __ mflr(r5);
+  __ addi(r6, sp, Operand(kSavedRegistersAreaSize));
+  __ sub(r6, fp, r6);
 
   // Allocate a new deoptimizer object.
   // Pass six arguments in r3 to r8.
-  __ PrepareCallCFunction(6, r8);
+  __ PrepareCallCFunction(5, r8);
   __ li(r3, Operand::Zero());
   Label context_check;
   __ LoadU64(r4,
@@ -3296,14 +3295,13 @@ void Generate_DeoptimizationEntry(MacroAssembler* masm,
   __ LoadU64(r3, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
   __ bind(&context_check);
   __ li(r4, Operand(static_cast<int>(deopt_kind)));
-  // r5: bailout id already loaded.
-  // r6: code address or 0 already loaded.
-  // r7: Fp-to-sp delta.
-  __ Move(r8, ExternalReference::isolate_address(isolate));
+  // r5: code address or 0 already loaded.
+  // r6: Fp-to-sp delta already loaded.
+  __ Move(r7, ExternalReference::isolate_address(isolate));
   // Call Deoptimizer::New().
   {
     AllowExternalCallThatCantCauseGC scope(masm);
-    __ CallCFunction(ExternalReference::new_deoptimizer_function(), 6);
+    __ CallCFunction(ExternalReference::new_deoptimizer_function(), 5);
   }
 
   // Preserve "deoptimizer" object in register r3 and get the input

src/builtins/s390/builtins-s390.cc

@@ -3654,19 +3654,18 @@ void Generate_DeoptimizationEntry(MacroAssembler* masm,
   static constexpr int kSavedRegistersAreaSize =
       (kNumberOfRegisters * kSystemPointerSize) + kDoubleRegsSize;
 
-  __ mov(r4, Operand(Deoptimizer::kFixedExitSizeMarker));
   // Cleanse the Return address for 31-bit
   __ CleanseP(r14);
   // Get the address of the location in the code object (r5)(return
   // address for lazy deoptimization) and compute the fp-to-sp delta in
   // register r6.
-  __ mov(r5, r14);
-  __ la(r6, MemOperand(sp, kSavedRegistersAreaSize));
-  __ SubS64(r6, fp, r6);
+  __ mov(r4, r14);
+  __ la(r5, MemOperand(sp, kSavedRegistersAreaSize));
+  __ SubS64(r5, fp, r5);
 
   // Allocate a new deoptimizer object.
   // Pass six arguments in r2 to r7.
-  __ PrepareCallCFunction(6, r7);
+  __ PrepareCallCFunction(5, r7);
   __ mov(r2, Operand::Zero());
   Label context_check;
   __ LoadU64(r3,
@@ -3675,18 +3674,17 @@ void Generate_DeoptimizationEntry(MacroAssembler* masm,
   __ LoadU64(r2, MemOperand(fp, StandardFrameConstants::kFunctionOffset));
   __ bind(&context_check);
   __ mov(r3, Operand(static_cast<int>(deopt_kind)));
-  // r4: bailout id already loaded.
-  // r5: code address or 0 already loaded.
-  // r6: Fp-to-sp delta.
+  // r4: code address or 0 already loaded.
+  // r5: Fp-to-sp delta already loaded.
   // Parm6: isolate is passed on the stack.
-  __ Move(r7, ExternalReference::isolate_address(isolate));
-  __ StoreU64(r7,
+  __ Move(r6, ExternalReference::isolate_address(isolate));
+  __ StoreU64(r6,
               MemOperand(sp, kStackFrameExtraParamSlot * kSystemPointerSize));
 
   // Call Deoptimizer::New().
   {
     AllowExternalCallThatCantCauseGC scope(masm);
-    __ CallCFunction(ExternalReference::new_deoptimizer_function(), 6);
+    __ CallCFunction(ExternalReference::new_deoptimizer_function(), 5);
   }
 
   // Preserve "deoptimizer" object in register r2 and get the input