Encode more precise scoping rules for function params.

Function params which outlive everything in the body (incl
temporaries).  Thus if we assign them their own `CodeExtent`, the
region inference can properly show that it is sound to have
temporaries with destructors that reference the parameters (because
such temporaries will be dropped before the parameters are).

This allows us to address issue 23338 in a clean way.

As a drive-by, fix a mistake in the tyencode for
`CodeExtent::BlockRemainder`.

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