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x86/itx: minor refactoring

Ronald S. Bultje requested to merge rbultje/dav1d:itx16sse_refactor into master

Removes some duplicate functionality, turn some inlined functions into functions, and improve/simplify some existing function implementations.

  • itx/x86: rewrite .transpose4x8packed so it uses only m0-3,4&6
  • itx/x86: replace idct8x8.transpose with idct8x4.transpose4x8packed
  • x86/itx: add 1/sqrt(2) (rect2) multiply macro
  • x86/itx: share pass2 loop between {16,32}x32 dct^2 functions
  • x86/itx: combine .write_8x8 and .round{1,2,3,4} into a single function
  • x86/itx: combine .write_8x4 and .round{1,2} into a single function
  • x86/itx: split dct/adst/identity pass=2 implementations for 16x8

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