[CS] Define a class for every locator path element kind #27433
Merged
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This is a follow-up to #26297. This PR uses macros to define the different kinds of locator path elements, which then allows us to define a
LocatorPathElt
subclass for each one.ConstraintLocator::isLastElement
is then changed to take aLocatorPathElt
subclass, making it consistent with the other last-element casting members.Finally this PR renames the
Requirement
path element toProtocolRequirement
in order to help avoid confusion withAnyRequirement
.