Packed ints performance test

Toke Eskildsen, te@ekot.dk, 20120629. See LUCENE-4062 for test code.

te-prime: Intel(R) Core(TM) i7 CPU Q 820 @ 1.73GHz, 8192 KB cache, JRE 1.6

te-prime: Intel(R) Core(TM) i7 CPU Q 820 @ 1.73GHz, 8192 KB cache, JRE 1.7

atria: Intel(R) Xeon(TM) CPU 3.20GHz, 2048 KB cache, JRE 1.6, iteration 3

pc254: Intel(R) Pentium(R) 4 CPU 3.20GHz, 2048 KB cache, JRE 1.6, 32 bit

pc254: Intel(R) Pentium(R) 4 CPU 3.20GHz, 2048 KB cache, JRE 1.7, 32 bit

mars: Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, 20480 KB cache, JRE 1.6

mars: Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, 20480 KB cache, JRE 1.7

alma: Desktop, Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 8192 KB cache, JRE 1.6