ppc64: [baseline] port AssertEqualToAccumulator

Change-Id: I7ff756acb4cbd272d60fedd527e22d47dabaac52
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3632510
Commit-Queue: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#80402}

src/baseline/ppc/baseline-assembler-ppc-inl.h

@@ -704,7 +704,8 @@ void BaselineAssembler::EmitReturn(MacroAssembler* masm) {
 
 inline void EnsureAccumulatorPreservedScope::AssertEqualToAccumulator(
     Register reg) {
-  UNIMPLEMENTED();
+  assembler_->masm()->CmpU64(reg, kInterpreterAccumulatorRegister);
+  assembler_->masm()->Assert(eq, AbortReason::kUnexpectedValue);
 }
 
 }  // namespace baseline