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Replaces the boolean 'build_libfuzzer' meson option with 'fuzzing_engine'.
This allows reproducing fuzzing test cases on systems without libfuzzer.
Also prevents regressions in the fuzzing test target since it will be
build by default.

Fixes an undefined shift in
clusterfuzz-testcase-minimized-dav1d_fuzzer-5685383740784640. Credits to
oss-fuzz.

Working only for the first Operating Point for now.

Fixes clusterfuzz-testcase-minimized-dav1d_fuzzer-5669943870226432. Credits to
oss-fuzz.

As indicated in the spec, get_poc_diff should return 0 when
order_hints are disabled.

Closes #77

Calling get_uniform(max=1) results in a read_bits(n=0),
In get_uniform, the n param is renamed to max to clarify the
semantics. Asserts are added to detect calls to get_uniform()
and get_bits() that don't actually read anything.

Closes #76

This is identical to what libaom does. Fixes #65.

Fixes #69.

Also prevent using warped motion when force_integer_mv=1. Fixes #84.

Fixes #83.

Fixes #82.

armasm64 fails to assemble this:
error A2173: syntax error in expression
        sub             x7,  x7,  w4, uxth

This clearly is a bug in armasm64, and will be reported. For now,
this workaround should be harmless though, as we've just loaded
the register with ldrh, so the upper parts of the register should
be zeroed.

Fixes #60.

These can be used in intrabc coding. Fixes #74.

Fixes #80.

checkasm --bench on a Qualcomm Kryo (Sanpdragon 820):
nop: 33.0
avg_w4_8bpc_c: 450.5
avg_w4_8bpc_neon: 20.1
avg_w8_8bpc_c: 438.6
avg_w8_8bpc_neon: 45.2
avg_w16_8bpc_c: 1003.7
avg_w16_8bpc_neon: 112.8
avg_w32_8bpc_c: 3249.6
avg_w32_8bpc_neon: 429.9
avg_w64_8bpc_c: 7213.3
avg_w64_8bpc_neon: 1299.4
avg_w128_8bpc_c: 16791.3
avg_w128_8bpc_neon: 2978.4
w_avg_w4_8bpc_c: 605.7
w_avg_w4_8bpc_neon: 30.9
w_avg_w8_8bpc_c: 545.8
w_avg_w8_8bpc_neon: 72.9
w_avg_w16_8bpc_c: 1430.1
w_avg_w16_8bpc_neon: 193.5
w_avg_w32_8bpc_c: 4876.3
w_avg_w32_8bpc_neon: 715.3
w_avg_w64_8bpc_c: 11338.0
w_avg_w64_8bpc_neon: 2147.0
w_avg_w128_8bpc_c: 26822.0
w_avg_w128_8bpc_neon: 4596.3
mask_w4_8bpc_c: 604.6
mask_w4_8bpc_neon: 37.2
mask_w8_8bpc_c: 654.8
mask_w8_8bpc_neon: 96.0
mask_w16_8bpc_c: 1663.0
mask_w16_8bpc_neon: 272.4
mask_w32_8bpc_c: 5707.6
mask_w32_8bpc_neon: 1028.9
mask_w64_8bpc_c: 12735.3
mask_w64_8bpc_neon: 2533.2
mask_w128_8bpc_c: 31027.6
mask_w128_8bpc_neon: 6247.2

Ordering the elements this way is more SIMD-friendly.

The simplified versions catches tg_start != 0 for the first tile group
too. Fixes a heap-buffer-overflow in setup_tile when the first tile index is
larger than 0 but the number of tiles is correct. Fixes #61, #73.

Fixes stack buffer overflows.

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.