[mlir][NFC] Apply rule of five to *Pass classes (#80998)

Define all special member functions for mlir::Pass, mlir::OperationPass,
mlir::PassWrapper and PassGen types since these classes explicitly
specify copy-ctor. This, subsequently, should silence static analysis
checkers that report rule-of-3 / rule-of-5 violations.

Given the nature of the types, however, mark other special member
functions deleted: the semantics of a Pass type object seems to be that
it is only ever created by being wrapped in a smart pointer, so the
special member functions are never to be used externally (except for the
copy-ctor - it is "special" since it is a "delegating" ctor for derived
pass types to use during cloning - see https://reviews.llvm.org/D104302
for details).

Deleting other member functions means that `Pass x(std::move(y))` - that
used to silently work (via copy-ctor) - would fail to compile now. Yet,
as the copy ctors through the hierarchy are under 'protected' access,
the issue is unlikely to appear in practice.

Co-authored-by: Asya Pronina <anastasiya.pronina@intel.com>
Co-authored-by: Harald Rotuna <harald.razvan.rotuna@intel.com>

0 files changed, 0 insertions, 0 deletions