[riscv64] Skip wasm SIMD test regress-1231950.js

Change-Id: Idae3870fc82ac117f9d7d916298123921bfcf286
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3089007Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Ji Qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/master@{#76262}

test/mjsunit/mjsunit.status

@@ -878,6 +878,7 @@
   'regress/wasm/regress-1161954': [SKIP],
   'regress/wasm/regress-1187831': [SKIP],
   'regress/wasm/regress-1199662': [SKIP],
+  'regress/wasm/regress-1231950': [SKIP],
   'regress/regress-1172797': [SKIP],
   'regress/wasm/regress-1179025': [SKIP],
   'wasm/multi-value-simd': [SKIP],