WIP: stgToCmm: -falignment-sanitisation not working on non-X86 arch (fix #23260)

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  • Changed the alignment code generation to happen at the stgToCmm stage, instead of the old native code generation stage. The cmm parser and a few other stgToCmm generation logic has to be changed accordingly.
  • Removed MO_AlignmentCheck constructor. That becomes unnecessary when the alignment check code generation moved to stdToCmm stage.

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Edited by husong998

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