RFR 8200118: [test] String concat tests should test toString() application order

[Claes Redestad]

On 2018-03-26 15:02, Aleksey Shipilev wrote:
>> Complete test coverage is important, so to cut down on testing
>> overheads then maybe it's time to examine if we can let go of some of the optional
>> variants (BC_SB_SIZED, MH_SB_SIZED, ...)?
> Maybe! I would prefer not to disable these in tests now, nor let go of some of them, because those
> strategies serve as backup options should the default strategy misbehave (like it does now, in some
> corner cases).

Right, I wasn't suggesting we remove all of them (or even do it now), 
but maybe start
examining which, if any, of these fallback options are being used in the 
wild and start
planning for deprecating and removing any unused ones in an orderly fashion.

/Claes