Fixes https://github.com/harfbuzz/harfbuzz/pull/1179

Fixes https://github.com/harfbuzz/harfbuzz/issues/1175

Now I wonder if any bots will be unhappy we calling | in static const initializations...
Or would that cost runtime init?  Our tests don't detect any..

ubsan generates these.

Needed to make ubsan work.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1174

Default exit value is 77, which causes autotools to "skip" test.

https://github.com/harfbuzz/harfbuzz/issues/1174
https://github.com/harfbuzz/harfbuzz/issues/1175

Some clang versions leave a std::round(float) weak symbol around...

If we wrote just this much every day...

https://github.com/harfbuzz/harfbuzz/issues/653#issuecomment-423905920

https://github.com/harfbuzz/harfbuzz/commit/62d1e0852a5549a1b510ad46a4b89f12730bb708#commitcomment-30613091

Towards disabling ZWJ-skipping in certain GPOS contexts.

Part of https://github.com/flutter/flutter/issues/16886

Ouch.  How did we not hit this bug before...

Fixes https://github.com/harfbuzz/harfbuzz/issues/653

Fixes https://github.com/harfbuzz/harfbuzz/issues/1171

I'm glad we have leak-detector bots now.

Decode the string as Python 3 returns bytes string, and also don’t
assume that it ends with a new line.

See also https://github.com/harfbuzz/harfbuzz/pull/1169

See also https://github.com/harfbuzz/harfbuzz/pull/1169

See also https://github.com/harfbuzz/harfbuzz/pull/1169

See also https://github.com/harfbuzz/harfbuzz/pull/1169

We reverse too many times. Can be optimized. But I doubt many fonts
use reverse lookups, so doesn't matter.

Other than not applying user features, this completes morx table
implementation.

Just speculation. Needs tests to determine which is correct behavior.