PPC/s390: [wasm-gc][liftoff] Reserve a stack slot for feedback

Port 9d3c9d47

Original Commit Message:

    So far the slot is set to 0; in an upcoming CL it will be
    used for an actual feedback vector.

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

Change-Id: Idbaa1d11fbfe81cf1106e4796c82ae6a1d6c1a11
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3212330Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#77289}

src/wasm/baseline/ppc/liftoff-assembler-ppc.h

@@ -32,11 +32,12 @@ namespace liftoff {
 //  -----+--------------------+  <-- frame ptr (fp)
 //  -1   | 0xa: WASM          |
 //  -2   |     instance       |
+//  -3   |    feedback vector |
 //  -----+--------------------+---------------------------
-//  -3   |    slot 0 (high)   |   ^
-//  -4   |    slot 0 (low)    |   |
-//  -5   |    slot 1 (high)   | Frame slots
-//  -6   |    slot 1 (low)    |   |
+//  -4   |    slot 0 (high)   |   ^
+//  -5   |    slot 0 (low)    |   |
+//  -6   |    slot 1 (high)   | Frame slots
+//  -7   |    slot 1 (low)    |   |
 //       |                    |   v
 //  -----+--------------------+  <-- stack ptr (sp)
 //
@@ -44,6 +45,8 @@ namespace liftoff {
 
 constexpr int32_t kInstanceOffset =
     (FLAG_enable_embedded_constant_pool ? 3 : 2) * kSystemPointerSize;
+constexpr int kFeedbackVectorOffset =
+    (FLAG_enable_embedded_constant_pool ? 4 : 3) * kSystemPointerSize;
 
 inline MemOperand GetHalfStackSlot(int offset, RegPairHalf half) {
   int32_t half_offset =
@@ -215,7 +218,7 @@ void LiftoffAssembler::AbortCompilation() { FinishCode(); }
 
 // static
 constexpr int LiftoffAssembler::StaticStackFrameSize() {
-  return liftoff::kInstanceOffset;
+  return liftoff::kFeedbackVectorOffset;
 }
 
 int LiftoffAssembler::SlotSizeForType(ValueKind kind) {

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -73,15 +73,17 @@ inline constexpr bool UseSignedOp(LiftoffCondition liftoff_cond) {
 //  -----+--------------------+  <-- frame ptr (fp)
 //  -1   | 0xa: WASM          |
 //  -2   |     instance       |
+//  -3   |    feedback vector |
 //  -----+--------------------+---------------------------
-//  -3   |    slot 0 (high)   |   ^
-//  -4   |    slot 0 (low)    |   |
-//  -5   |    slot 1 (high)   | Frame slots
-//  -6   |    slot 1 (low)    |   |
+//  -4   |    slot 0 (high)   |   ^
+//  -5   |    slot 0 (low)    |   |
+//  -6   |    slot 1 (high)   | Frame slots
+//  -7   |    slot 1 (low)    |   |
 //       |                    |   v
 //  -----+--------------------+  <-- stack ptr (sp)
 //
 constexpr int32_t kInstanceOffset = 2 * kSystemPointerSize;
+constexpr int kFeedbackVectorOffset = 3 * kSystemPointerSize;
 
 inline MemOperand GetStackSlot(uint32_t offset) {
   return MemOperand(fp, -offset);
@@ -197,7 +199,7 @@ void LiftoffAssembler::AbortCompilation() { AbortedCodeGeneration(); }
 
 // static
 constexpr int LiftoffAssembler::StaticStackFrameSize() {
-  return liftoff::kInstanceOffset;
+  return liftoff::kFeedbackVectorOffset;
 }
 
 int LiftoffAssembler::SlotSizeForType(ValueKind kind) {