PPC: Use scratch register passed to SwapSimd128

Change-Id: I8545da4fa9eff1ff7de3779022fe2c34966951d6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3846853Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#82674}

src/codegen/ppc/macro-assembler-ppc.cc

@@ -3989,7 +3989,7 @@ void TurboAssembler::SwapSimd128(Simd128Register src, MemOperand dst,
                                  Simd128Register scratch1, Register scratch2) {
   DCHECK(src != scratch1);
   LoadSimd128(scratch1, dst, scratch2);
-  StoreSimd128(src, dst, ip);
+  StoreSimd128(src, dst, scratch2);
   vor(src, scratch1, scratch1);
 }