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ada46a0cf0
Restructure the inference logic to allow the same function declaration to
independently annotate or infer different lifetime targets.
For example:
@_lifetime(borrow a)
/* DEFAULT: @_lifetime(b: copy b)
func f(a: A, b: inout B) -> NE
The fact that we prevented this was somewhat accidental and surprising.
This restructuring simplifies the code but also gives us much more control over
the inference logic.
Fixes: rdar://159288750 ("A function cannot have a ~Escapable 'inout' parameter
in addition to other ~Escapable parameters" is not actionable)