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Sets the meson b_ndebug option to default to if-release,
so that asserts are disabled in release builds.

Helped-by: Henrik Gramner <gramner@twoorioles.com>

This will help when writing x86_64 assembly.

This fixes warnings like these, if not all bitdepths are enabled:

../src/decode.c: In function ‘dav1d_submit_frame’:
../src/decode.c:2825:5: warning: "CONFIG_10BPC" is not defined [-Wundef]
 #if CONFIG_10BPC

Despite what MSDN says, this intrinsic doesn't exist for ARM,
only for ARM64.

All the functions are public, and the only prototype in this header
is a duplicate.

Fix following ubsan error in #68:
../src/env.h:296:24: runtime error: shift exponent -1 is negative
[Detaching after fork from child process 22253]
    #0 0x7ffff76ad6f9 in get_poc_diff /home/janne/src/dav1d/build-usan/../src/env.h:296:24
    #1 0x7ffff76ad6f9 in parse_frame_hdr /home/janne/src/dav1d/build-usan/../src/obu.c:757
    #2 0x7ffff7696491 in dav1d_parse_obus /home/janne/src/dav1d/build-usan/../src/obu.c:1023:20
    #3 0x7ffff7921c7d in dav1d_decode /home/janne/src/dav1d/build-usan/../src/lib.c:193:20
    #4 0x424869 in main /home/janne/src/dav1d/build-usan/../tools/dav1d.c:108:20
    #5 0x7ffff63dfae6 in __libc_start_main (/lib64/libc.so.6+0x21ae6)
    #6 0x403489 in _start (/home/janne/src/dav1d/build-usan/tools/dav1d+0x403489)

I can't reproduce the ubsan error in the issue.

Reject out of range values as errors and avoid undefined shifts. Fixes #67.

Fixes #66. Also fixes a leak of the demuxer context.

Fixes #66.

Fixes #62.

Reverts commit f17c5e08 "check IntraBC
displacement vector".
Fixes #63 and an overlapping memcpy in
clusterfuzz-testcase-minimized-dav1d_fuzzer-5675967192760320. Credits to
oss-fuzz and Tyson Smith.

wiener_luma_8bpc_c: 326272.1
wiener_luma_8bpc_avx2: 19841.5

Decoding time of first 1000 frames of Chimera-8bit-1920x1080.ivf goes
from 27.471 to 23.558 seconds.

Also copy 4 pixels so SIMD can use a padded write (movd).

Deriving uvtx for chroma-from-luma is the same for lossless.
The availability of CfL is constrained to when they match.

Removes the splat of pixels that are then overwritten.
Rename cfl_pred_1 to cfl_pred now that there is only one.

Fixes emmory leak with asan seen with 'dav1d --tilethreads 2 ...'

Makes the tile parsing code simpler. Fixes a heap buffer overflow with
clusterfuzz-testcase-minimized-dav1d_fuzzer-5726018392817664. Credit to
oss-fuzz.

When breaking out of the decoding either through an error or reaching
the limit of decoded frames the input buffer might not be fully consumed
by the previous dav1d_decode() call. Fixes a memory leak discovered
while testing with frame and tile threads with --limit.

Fixes a heap buffer overflow in
clusterfuzz-testcase-minimized-dav1d_fuzzer-5677513716531200. Credits to
oss-fuzz.

On ARM, the readtime implementations are instructions that might
not always be allowed at runtime (depending on whether the kernel
has allowed user mode code to access the cycle counter registers).
In order to allow building checkasm with the option for benchmarking,
while still running on devices where benchmarking isn't possible,
don't use readtime anywhere unless --bench has been specified.

Use GetTickCount for the seed on windows, and gettimeofday on unix.

Fixes segfaults with
david-fuzzing-data:artifacts/crash-b9015ad03b63131c25016592c3535da1268a08ad.

Fixes an input validation error due to not cleared reference frame refs
in Dav1dFrameContext with
dav1d-fuzzing-data:artifacts/crash-b9015ad03b63131c25016592c3535da1268a08ad.

Fixess heap overflow with
clusterfuzz-testcase-minimized-dav1d_fuzzer-5720347626700800
Credit to OSS-Fuzz

Fixes a null pointer dereference with
clusterfuzz-testcase-minimized-dav1d_fuzzer-5670100066107392.
Credit to OSS-Fuzz

Seen with clusterfuzz-testcase-minimized-dav1d_fuzzer-5749222154960896,
Credit to OSS-Fuzz.