Revert "test: skip mutable-global-sharing wpt on big-endian platforms"

This reverts commit 643faf0.

Author: guybedford

test/wpt/status/wasm/jsapi.json

@@ -12,9 +12,6 @@
       ]
     }
   },
-  "esm-integration/mutable-global-sharing.tentative.any.js": {
-    "skip": "v128 SIMD globals broken on big-endian platforms due to a V8 bug"
-  },
   "esm-integration/v128-tdz.tentative.any.js": {
     "skip": "v128 undefined Wasm bindings not yet supported in V8"
   },

test/wpt/test-wasm-jsapi.mjs

@@ -18,5 +18,14 @@ if (supportsSimd) {
   const runner = new WPTRunner('wasm/jsapi');
   runner.setFlags(['--experimental-wasm-modules']);
 
+  // v128 SIMD globals are broken on s390x due to a V8 big-endian bug.
+  if (process.arch === 's390x') {
+    for (const spec of runner.specs) {
+      if (spec.filename === 'esm-integration/mutable-global-sharing.tentative.any.js') {
+        spec.skipReasons.push('v128 SIMD globals broken on s390x due to V8 big-endian bug');
+      }
+    }
+  }
+
   runner.runJsTests();
 }