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x86: Fix data being stored below the stack pointer in SSSE3 itx asm

Henrik Gramner requested to merge gramner/dav1d:x86_ssse3_itx_data_below_sp into master

The idct64 code would previously temporarily store some data below the stack pointer, which could in rare circumstances be clobbered due to interrupts etc.

Fixes #386.

Edited by Henrik Gramner

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