h264: Integrate clear_blocks calls with IDCT

The non-intra-pcm branch in hl_decode_mb (simple, 8bpp) goes from 700
to 672 cycles, and the complete loop of decode_mb_cabac and hl_decode_mb
(in the decode_slice loop) goes from 1759 to 1733 cycles on the clip
tested (cathedral), i.e. almost 30 cycles per mb faster.

Signed-off-by: Martin Storsjö <martin@martin.st>
h264: Only initialize dsputil if error resilience is enabled

It is only used for error resilience. This allows building the
h264 decoder without dsputil, if error resilience is disabled.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit '62844c3fd66940c7747e9b2bb7804e265319f43f'

* commit '62844c3fd66940c7747e9b2bb7804e265319f43f':
  h264: Integrate clear_blocks calls with IDCT

Conflicts:
	libavcodec/arm/h264idct_neon.S
	libavcodec/h264idct_template.c
	libavcodec/x86/h264_idct.asm

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'ubitux/shorthand-cleanup'

* ubitux/shorthand-cleanup:
  lavfi/setfield: switch to an AVOptions-based system.
  lavfi/asettb: switch to an AVOptions-based system.
  lavfi/aselect: switch to an AVOptions-based system.
  lavfi/sine: switch to an AVOptions-based system.
  lavfi/deshake: switch to an AVOptions-based system.
  lavfi/tinterlace: switch to an AVOptions-based system.
  lavfi/tile: switch to an AVOptions-based system.
  lavfi/concat: switch to an AVOptions-based system.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '85deb51a01f1ecc5ac5faa52ad8ea141c384e23a'

* commit '85deb51a01f1ecc5ac5faa52ad8ea141c384e23a':
  h264: Only initialize dsputil if error resilience is enabled

Conflicts:
	libavcodec/h264.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
lavfi/field: cleanup unused shorthand and doc.
lavfi/overlay: cleanup unused shorthand.
lavfi/smartblur: cleanup unused shorthand and doc.