[cleanup][turbofan] Remove empty else if in RegisterAllocator.

Cq-Include-Trybots: luci.v8.try:v8_linux64_pointer_compression_rel_ng
Cq-Include-Trybots: luci.v8.try:v8_linux64_arm64_pointer_compression_rel_ng
Bug: v8:9396
Change-Id: Ie00cb7de1b16525553baf9b555b3f84e8d86d073
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1702617Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62739}

src/compiler/backend/register-allocator.cc

@@ -1974,14 +1974,6 @@ void ConstraintBuilder::MeetConstraintsBefore(int instr_index) {
             second->reference_map(), &gap_move->source()};
         data()->delayed_references().push_back(delayed_reference);
       }
-    } else if (!code()->IsReference(input_vreg) &&
-               code()->IsReference(output_vreg)) {
-      // The input is assumed to immediately have a tagged representation,
-      // before the pointer map can be used. I.e. the pointer map at the
-      // instruction will include the output operand (whose value at the
-      // beginning of the instruction is equal to the input operand). If
-      // this is not desired, then the pointer map at this instruction needs
-      // to be adjusted manually.
     }
   }
 }