onnxruntime

6e1c3003 - DML EP and MLAS buffer allocator - increase alignment to 64 bytes for AVX-512 processing (#15141)

DML EP and MLAS buffer allocator - increase alignment to 64 bytes for AVX-512 processing (#15141) Fixes #13119 top concerns by * using `onnxruntime::AllocatorDefaultAlloc` instead of `malloc` * set `MLAS_DEFAULT_PREFERRED_BUFFER_ALIGNMENT=64` which cascades that value to several members and functions not directly related to MLAS. ### Motivation and Context * Fixes #13119 top concerns. Otherwise, alignment is to 16 bytes circa 1990s 👴 * Does not yet enable flexible alignment. Instead fixed at 64 (64 x 8 bits=512 bits) for modern NN hardware like AVX-512