[PATCH] Fix two issues on unaligned 256-bit vector memory access on AVX

[Michael Liao]

Hi All

On Sandybridge, unaligned 256-bit vector memory access needs splitting
to avoid higher cache line split penalty. The 1st patch enhances ToT to
handle non <4 x i64> vector integer types. The 2nd patch fixes two
alignment calculation issues in ToT. One is a memory access is regarded
as aligned if the specified alignment is larger than the natural
alignment; the other issue is that the alignment for the high 128-bit
vector should be min(16, original alignment) since the pointer is
advanced by 16B, a power-of-2 offset.

Test cases are included for each patch.

Thanks for review
- Michael

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