[5.8][TaskLocals] Avoid use of defer
in back deployed functions in the standard library
#62947
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Cherry pick of #62946.
Older versions of the 5.8 compiler have a bug when generating SIL for functions with
@_backDeploy
containing defer blocks (#62444) and for now we need the standard library interface to be compatible with those older compilers.Resolves rdar://104045168