x86_64: align malloc() allocations on 16 bytes.

* added a check in memalign_test.

Add a memalign test that checks for valid alignments and fills/verifies
allocated buffers to validate that the full allocated size is actually usable.


git-svn-id: file:///srv/svn/repos/haiku/haiku/

Add a memalign test that checks for valid alignments and fills/verifies
allocated buffers to validate that the full allocated size is actually usable.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35425 a95241bf-73f2-0310-859d-f6bbb57e9c96

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