target/arm: Flush high bits of sve register after AdvSIMD TBL/TBX

Writes to AdvSIMD registers flush the bits above 128.
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20200214194643.23317-3-richard.henderson@linaro.org
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target/arm/translate-a64.c

@@ -6964,6 +6964,7 @@ static void disas_simd_tb(DisasContext *s, uint32_t insn)
     tcg_temp_free_i64(tcg_resl);
     write_vec_element(s, tcg_resh, rd, 1, MO_64);
     tcg_temp_free_i64(tcg_resh);
+    clear_vec_high(s, true, rd);
 }
 
 /* ZIP/UZP/TRN