[Wrap-up] Vectorize wrapup

[rorhcdream]

• Remove assertion
• Remove Instcombine before vectorize
• Add handling bitcast, inttoptr, trunc instructino to getDifference function
• Disable load user sink when no load vectorize

Improvement from last commit

benchmark	improve
anagram	0.00%
binary_tree	0.00%
bitcount1	0.00%
bitcount2	0.00%
bitcount3	0.00%
bitcount4	0.04%
bitcount5	0.00%
bubble_sort	0.00%
collatz	0.00%
dynalloca	0.00%
floyd	0.38%
gcd	0.00%
jenkins_hash	4.63%
matmul1	41.45%
matmul2	0.16%
matmul3	0.35%
matmul4	0.39%
merge_sort	0.00%
prime	0.00%
quick_sort	0.00%
radix_sort	0.00%
rmq1d_naive	-5.15%
rmq1d_sparsetable	-0.01%
rmq2d_naive	0.00%
rmq2d_sparsetable	-0.04%