PPC: remove unused instruction under deoptimization entry

It's a leftover from this change: https://crrev.com/c/2486225

Change-Id: Iec7891438a6a96a374299fb488f3231c63396e42
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2892252Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74528}

src/builtins/ppc/builtins-ppc.cc

@@ -3234,9 +3234,6 @@ void Generate_DeoptimizationEntry(MacroAssembler* masm,
   const int kSavedRegistersAreaSize =
       (kNumberOfRegisters * kSystemPointerSize) + kDoubleRegsSize;
 
-  // Get the bailout id is passed as r29 by the caller.
-  __ mr(r5, r29);
-
   __ 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