Remove unneeded case in uninitialized_default_construct_n

[miscco]

There was a leftover from #1164 where I forgot to remove the unneeded specialization from uninitialized_default_construct_n

[StephanTLavavej]

Thanks, seems reasonable to me. To verify my understanding - this isn't needed because the "general" case below handles it, and there's no significant savings from avoiding construction of the backout-guard when no exceptions are possible.

I changed the PR title because "specialization" has a very specialized meaning when one works with templates all day, every day ("case" also has a specific meaning but it doesn't strongly connote "switch statement" 😹).

[CaseyCarter]

To verify my understanding - this isn't needed because the "general" case below handles it, and there's no significant savings from avoiding construction of the backout-guard when no exceptions are possible.

Yes, that's it exactly. There were cases like this in many of the algorithms at one point, which @miscco removed after some investigation showed that it didn't significantly affect codegen.

[StephanTLavavej]

Thanks for this small cleanup! 🐈