ARM64 HS_FLAG_DOTALL causing false negatives

[Blueblood1]

Hi, we believe we have encountered a bug with Vectorscan's ARM support.

Tested with chips: AWS Graviton, Apple M1 Pro, Apple M4 Pro

Seen on version: 5.4.12

With HS_FLAG_DOTALL

pattern: curl.*\|\s*python

input: curl http://xxx:8000/ 2>&1 | python ✅ Match
input: curl http://xxxx:8000/ 2>&1 | python ❌ No match
input: curl http://vader:8080/ 2>&1 | python ❌ No mach

Without HS_FLAG_DOTALL

pattern: curl.*\|\s*python

input: curl http://xxx:8000/ 2>&1 | python ✅ Match
input: curl http://xxxx:8000/ 2>&1 | python ✅ Match
input: curl http://vader:8080/ 2>&1 | python ✅ Match

With PCRE all match.

On x86 with Hyperscan 5.4.2 all match.

Note: We haven't tried Vectorscan on x86, only on ARM.

I've added some unit tests here, 3 of which are failing.