Andrew Trick f9861ec9c0 Add APIs for terminator results that forward ownership. ...

Add TermInst::forwardedOperand.

Add SILArgument::forwardedTerminatorResultOperand. This API will be
moved into a proper TerminatorResult abstraction.

Remove getSingleTerminatorOperand, which could be misused because it's
not necessarilly forwarding ownership.

Remove the isTransformationTerminator API, which is not useful or well
defined.

Rewrite several instances of complex logic to handle block arguments
with the simple terminator result API. This defines away potential
bugs where we don't detect casts that perform implicit conversion.

Replace uses of the SILPhiArgument type and code that explicitly
handle block arguments. Control flow is irrelevant in these
situations. SILPhiArgument needs to be deleted ASAP. Instead, use
simple APIs like SILArgument::isTerminatorResult(). Eventually this
will be replaced by a TerminatorResult type.

2022-12-12 12:37:35 -08:00

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