[SelectionDAG] Virtualize isTargetStrictFPOpcode / isTargetMemoryOpcode (#119969)

With this change, targets are no longer required to put memory / strict-fp opcodes after special
`ISD::FIRST_TARGET_

[SelectionDAG] Virtualize isTargetStrictFPOpcode / isTargetMemoryOpcode (#119969)

With this change, targets are no longer required to put memory / strict-fp opcodes after special
`ISD::FIRST_TARGET_MEMORY_OPCODE`/`ISD::FIRST_TARGET_STRICTFP_OPCODE` markers.
This will also allow autogenerating `isTargetMemoryOpcode`/`isTargetStrictFPOpcode (#119709).

Pull Request: https://github.com/llvm/llvm-project/pull/119969

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[SelectionDAG] Add empty implementation of SelectionDAGInfo to some targets (#119968)

#119969 adds a couple of new methods to this class, which will need to
be overridden by these targets.

Part of

[SelectionDAG] Add empty implementation of SelectionDAGInfo to some targets (#119968)

#119969 adds a couple of new methods to this class, which will need to
be overridden by these targets.

Part of #119709.

Pull Request: https://github.com/llvm/llvm-project/pull/119968

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