Migrate more tests from blink repository.

test/webkit/fast/js/kde/assignments-expected.txt

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-This test checks that iterating a large array backwards works correctly.
+KDE JS Test
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS verify(32768) is true
-PASS verify(65536) is true
-PASS verify(120000) is true
+PASS var i = 1; i is 1
+PASS j = k = 2 is 2
+PASS var i; i is undefined.
+PASS var i = 1; i <<= 2 is 4
+PASS var i = 8; i >>= 1 is 4
+PASS var i = 1; i >>= 2 is 0
+PASS var i = -8; i >>= 24 is -1
+PASS var i = 8; i >>>= 2 is 2
+PASS var i = -8; i >>>= 24 is 255
 PASS successfullyParsed is true
 
 TEST COMPLETE