Use Arrays.compareUnsigned instead of iterating compare.

[vsop-479]

Similar to SegmentTermsEnumFrame, we can use Arrays.compareUnsigned instead of iterating compare, in SegmentTermsEnum.seekCeil and SegmentTermsEnum.seekExact.

[vsop-479]

@mikemccand

Please take a look when you get a chance.

[rmuir]

This looks like a good improvement, these Arrays methods become much faster than the home-written loops for longer arrays.

[uschindler]

Great. Better replace all those handwritten loops with Arrays methods. We did this for the first time to improve Lucene 8.x with Java9+ (using MR-JAR).

[mikemccand]

Looks great, thank you @vsop-479! I'll merge soon.

[mikemccand]

Woops, there are now conflicts here (from the binary search PR) -- maybe you could resolve them @vsop-479, and add a CHANGES.txt entry too? Thanks!

[vsop-479]

I will resolve the conflicts, and try to find other handwritten loops. Thanks @mikemccand @uschindler .

[vsop-479]

@mikemccand
I resolved the conflicts, and added a CHANGES.txt entry.
Please take a look when you get a chance.