We reset .Lpic_gp to zero at the start of each function, which means
that the logic within movrelx for clearing gp when necessary will
be missed.

This fixes using movrelx in different functions with a different
helper register.

This is cherry-picked from libav commit
824e8c28.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

Make them aligned, to allow efficient access to them from simd.

This is an adapted cherry-pick from libav commit
a4cfcddc.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

Fixes: 177/fuzz-3-ffmpeg_VIDEO_AV_CODEC_ID_FLV1_fuzzer

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

Also a small cosmetic change to the avx2 idct16 version to make it
explicit that one of the arguments to the write-out macros is unused
for >=avx2 (it uses pmovzxbw instead of punpcklbw).

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes: 173/fuzz-3-ffmpeg_SUBTITLE_AV_CODEC_ID_MOV_TEXT_fuzzer

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This is similar to commit 9ac61e73.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

Reviewed-by: Moritz Barsnick <barsnick@gmx.net>
Signed-off-by: Lou Logan <lou@lrcd.com>

Found-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>

* commit 'f8d17d53':
  checkasm: Add tests for vp8dsp
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'e8b96a77':
  arm: Fix a typo in a comment
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'dc08bbf6':
  vp8dsp: Clarify the first dimension of the mc function tables
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '924e2ecd':
  qsvdec: when a frames ctx is supplied, use its frame dimensions
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '92736c74':
  qsvdec: add support for P010 (10-bit 420) decoding
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'ce320cf1':
  qsvdec: use the same mfxFrameInfo for allocating frames that was passed to DECODE_Init
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '536bb17e':
  qsvdec: make ff_qsv_map_pixfmt() return a MFX fourcc as well
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'd20c1189':
  hwcontext_qsv: add support for p010
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '40f74dc8':
  matroskadec: export CodecDelay

Noop, we already export CodecDelay
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '582d4211':
  vf_scale_vaapi: Respect driver quirks around buffer destruction
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '221ffca6':
  vaapi_encode: Respect driver quirks around buffer destruction
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '4926fa9a':
  hwcontext_vaapi: Add driver quirks to the hwdevice
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '2ef87815':
  hwcontext_dxva2: add support for p010
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'e78e5b73':
  swscale: add P010 input support

This commit is a noop, see 2e31434dMerged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'b7c5f885':
  pixfmt: add P010 pixel format

This commit is a noop, see c2869b46Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'b55566db':
  avconv: use avcodec_parameters_copy() with streamcopy

The fate-aac-autobsf-adtstoasc changes from writing an audio bitdepth
based on the sample format, which is now available.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'be3e807c':
  oggparseopus: export pre-skip

Noop, we already export this information
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '029cf99c':
  mov: Save number of stsd elements after stream extradata allocation

Mostly noop, see 8b43ee40Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '6c445990':
  tiffenc: Check zlib support for deflate option during initialization
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '9f732e4c':
  tiffenc: Check av_pix_fmt_desc_get() return value
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'd8f3b0fb':
  targaenc: Move size check to initialization function
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'eeb6849c':
  rle: K&R formatting cosmetics
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '326d9116':
  build: Drop unnecessary libavcodec <-> libavformat object dependencies
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'e72d6fa0':
  build: Move MP2 muxer declaration away from MP3 muxer code
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '67cb2c0f':
  checkasm: hevc: Iterate over features first, then over bitdepths

Noop, we don't have these checkasm tests.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'fe27792f':
  build: Move ff_mpeg12_frame_rate_tab to a separate file
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

Fixes the second sample from ticket #5544.

Based on 19be5fb7 by Luca Barbato.

Based on 7471352f by Luca Barbato.