swift234

A couple of related changes:
- Enhance SILBuilder::emitStrongRelease to be smarter.
- Start using emitStrongRelease in type lowering, SILGen,
  CapturePromotion (replacing its implementation of the
  same logic), and MandatoryInlining (one more place)
- Rename the primitive createStrongRetain/ReleaseInst
  instructions to lose their suffix.
- Now that createStrongRetain/ReleaseInst are not special
  cases from the naming perspective, remove some special cases
  from DeserializeSIL and ParseSIL.
  


Swift SVN r10449