[IR][TableGen] Remove unused Attribute::isExistingAttribute (NFC) (#233682)
The last caller of Attribute::isExistingAttribute was removed on July
6, 2026 in commit dc9edeb0453bd54b7461dae7feb5b35b784914fa.
This patch removes Attribute::isExistingAttribute along with the
ATTRIBUTE_ALL macro, which became unused as a result.
Assisted-by: Antigravity
[mlir] Replace PointerUnion::dyn_cast with llvm::dyn_cast (NFC) (#233681)
PointerUnion::dyn_cast has been soft-deprecated. This patch replaces it
with llvm::dyn_cast:
- PadTilingInterface.cpp: Each OpFoldResult in paddedShape is a
nonnull Attribute or Value, and dynamic dimensions must be valid
Values.
- TestOps.td: CallWithSegmentsOp::setCalleeFromCallable is an unused
CallOpInterface implementation on a test op.
This patch completes the migration away from PointerUnion::dyn_cast
under mlir/.
Assisted-by: Antigravity