Migrated several tests from blink to V8 repository.

test/webkit/array-sort-sparse-expected.txt

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-Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating.
+This tests that arrays and array like objects containing holes are sorted correctly.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS [42].concat() is [42]
+PASS testSort([,undefined,0,1]) is true
+PASS testSort({length:4,1:undefined,2:0,3:1}) is true
 PASS successfullyParsed is true
 
 TEST COMPLETE