PPC [simd]: Implement LoadReverseSimd128RR on codegen

Change-Id: Icec47ff9263368a0f061e71648e99ffbe5f1a0ea
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2798214Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73758}

src/compiler/backend/ppc/code-generator-ppc.cc

@@ -2064,6 +2064,10 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
     }
+    case kPPC_LoadReverseSimd128RR: {
+      __ xxbrq(i.OutputSimd128Register(), i.InputSimd128Register(0));
+      break;
+    }
     case kPPC_StoreWord8:
       ASSEMBLE_STORE_INTEGER(stb, stbx);
       break;