[wasm-simd] Enable skipped regression test

Test was skipped because the generated test contains multi-byte opcode,
and wasn't correct. Fix up the test with the correct encoding. The
fuzzer now generates multi-byte opcodes correctly, and so shouldn't be
an issue.

Bug: v8:10486
Change-Id: I1f5ad7d456320a30da6c553f65fdca0fc86a291a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2505238Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70864}

test/mjsunit/mjsunit.status

@@ -70,10 +70,6 @@
   # Enable once serializing a running isolate is fully implemented.
   'serialize-deserialize-now': [SKIP],
 
-  # https://crbug.com/v8/issues/10486
-  # Enable once multi-byte prefixed opcodes are correctly handled
-  'regress/wasm/regress-1065599': [SKIP],
-
   # BUG(v8:9506): times out.
   'wasm/shared-memory-worker-explicit-gc-stress': [PASS, SLOW],
   'wasm/shared-memory-worker-gc-stress': [PASS, SLOW],

test/mjsunit/regress/wasm/regress-1065599.js

@@ -13,14 +13,14 @@ builder.addType(makeSig([kWasmI32, kWasmI32, kWasmI32], [kWasmI32]));
 builder.addFunction(undefined, 0 /* sig */).addBodyWithEnd([
   // signature: i_iii
   // body:
-  kExprI32Const, 0xba, 0x01,       // i32.const
-  kSimdPrefix, kExprI16x8Splat,    // i16x8.splat
-  kExprMemorySize, 0x00,           // memory.size
-  kSimdPrefix, kExprI16x8ShrS,     // i16x8.shr_s
-  kSimdPrefix, kExprV8x16AnyTrue,  // v8x16.any_true
-  kExprMemorySize, 0x00,           // memory.size
-  kExprI32RemS,                    // i32.rem_s
-  kExprEnd,                        // end @15
+  kExprI32Const, 0xba, 0x01,          // i32.const
+  kSimdPrefix, kExprI16x8Splat,       // i16x8.splat
+  kExprMemorySize, 0x00,              // memory.size
+  kSimdPrefix, kExprI16x8ShrS, 0x01,  // i16x8.shr_s
+  kSimdPrefix, kExprV8x16AnyTrue,     // v8x16.any_true
+  kExprMemorySize, 0x00,              // memory.size
+  kExprI32RemS,                       // i32.rem_s
+  kExprEnd,                           // end @15
 ]);
 builder.addExport('main', 0);
 const instance = builder.instantiate();