Manipulating failing ConstructorStats test to pass, to be able to run all tests with ASAN.

This version of the code is ASAN clean with unique_ptr or smart_holder as the default.

This change needs to be reverted after adopting the existing move-only-if-refcount-is-1
logic used by type_caster_base.
3 jobs for archive/pr2672_sideline_cast_shtc_interleaved in 0 seconds (queued for 80 minutes and 59 seconds)
Status Job ID Name Coverage
  Build
failed #2682
build

 
  Test
failed #2684
allowed to fail
code_quality

failed #2683
test

 
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failed
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code_quality Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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build Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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