test/mjsunit/regress/regress-94425.js

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// Flags: --expose-gc

var N = 2040 - 2 + 10;
var arr = new Array(N);

gc();
gc();
gc();

// arr is in the large object space now.
// Write new space object into it.
arr[arr.length - 2] = new Object;

// Shift array multiple times to ensure that young
// object crosses region boundary.
for (var i = 0; i < 9; i++) arr.shift();

// Do a GC to verify region dirty marks.
gc();