Save StringConcat bytecode generation for one-time operation

[franz1981]

This has popup as a bytecode generation operation which can both save memory and CPU time at startup, see

It both save the lambda generation and, most importantly, a useless string concatenation.

[dmlloyd]

Why not just eliminate the string concatenation and keep the lambda? Keeping the lambda means one less class to load from disk.

[franz1981]

@dmlloyd I have no strong opinion on this, so I can do it like that as well

[dmlloyd]

:+1: it's probably better to keep the fix down to the thing being fixed when possible.

[franz1981]

@radcortez similar to the others we know about ^^

[geoand]

I actually independently came up with https://github.com/smallrye/smallrye-common/pull/388

[radcortez]

Closed in favor of #388.