ppc64: [baseline] Add scratch reg to Move

Change-Id: I10e917111acd7fd3eeaa92b2b38cf6e8b66ffeab
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3707655
Commit-Queue: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#81186}

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

@@ -769,7 +769,10 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
   void Move(Register dst, ExternalReference reference);
   void Move(Register dst, Register src, Condition cond = al);
   void Move(DoubleRegister dst, DoubleRegister src);
-  void Move(Register dst, const MemOperand& src) { LoadU64(dst, src); }
+  void Move(Register dst, const MemOperand& src) {
+    // TODO: use scratch register scope instead of r0
+    LoadU64(dst, src, r0);
+  }
 
   void SmiUntag(Register dst, const MemOperand& src, RCBit rc = LeaveRC,
                 Register scratch = no_reg);