keep getSerializedATNSegmentLimit at max int

[parrt]

I generated code with getSerializedATNSegmentLimit() set to 80 (current dev value) and max int. Here is diff with C++ target:

On the left we see small segments but it's unnecessary and wasteful compared to the big static array on right. This PR makes it look like right side. Only Java really needs this. Targets are free to ignore getSerializedATNSegmentLimit() as JavaScript does. I.e., JavaScript always looks like right side of pic.

@KvanTTT @marcospassos @jcking @ericvergnaud @mike-lischke Any concerns?

[KvanTTT]

It's ok, but I've already fixed it in #3513 Also, C++ does not need getSerializedATNSegmentLimit call at all because it does not have a restriction on the size of array of literal.

[parrt]

Ok, well, maybe take the new comments i have here?

JavaScript does:

SerializedATN(model) ::= <<
<! only one segment, can be inlined !>

const serializedATN = ["<model.serialized; wrap={",<\n>    "}>"].join("");

>>

And C++ can be simplified to the equivalent if someone wants to put the effort in.

[mike-lischke]

Looks fine to me.

[KvanTTT]

Ok, well, maybe take the new comments i have here?

Let's merge your PR and I'll rebase on dev and drop my commit.

And C++ can be simplified to the equivalent if someone wants to put the effort in.

Yes, I've already done it as well. Also for Dart and PHP.