AArch64: Update neoverse512tvb tuning

Fix the neoverse512tvb tuning to be like Neoverse V1/V2 and add the
missing AARCH64_EXTRA_TUNE_BASE and AARCH64_EXTRA_TUNE_AVOID_PRED_RMW.

gcc:
	* config/aarch64/tuning_models/neoverse512tvb.h (tune_flags): Update.

gcc/config/aarch64/tuning_models/neoverse512tvb.h

@@ -155,8 +155,10 @@ static const struct tune_params neoverse512tvb_tunings =
   2,	/* min_div_recip_mul_df.  */
   0,	/* max_case_values.  */
   tune_params::AUTOPREFETCHER_WEAK,	/* autoprefetcher_model.  */
-  (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
-   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT),	/* tune_flags.  */
+  (AARCH64_EXTRA_TUNE_BASE
+   | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
+   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
+   | AARCH64_EXTRA_TUNE_AVOID_PRED_RMW),	/* tune_flags.  */
   &generic_armv9a_prefetch_tune,
   AARCH64_LDP_STP_POLICY_ALWAYS,   /* ldp_policy_model.  */
   AARCH64_LDP_STP_POLICY_ALWAYS	   /* stp_policy_model.  */