[x264-devel] add optimised functions (zigzag_scan_4x4)

[Noboru Asai]

Hi,

These patches add the following optimised functions accelerated with altivec
and test functions.

o x264_zigzag_scan_4x4_frame_altivec()
o x264_zigzag_scan_4x4ac_frame_altivec()
o x264_zigzag_scan_4x4_field_altivec()
o x264_zigzag_scan_4x4ac_field_altivec()

Any comments are welcome.

Noboru Asai
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