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[AArch64] Refactor definition of EXT patterns to use a multiclass

Description

[AArch64] Refactor definition of EXT patterns to use a multiclass

Using a multiclass reduces duplication, and makes it easier to add new patterns
later. This refactoring does add some new patterns, but as far as I can tell
there's no IR that will end up triggering them so this is effectively NFC.

Differential Revision: https://reviews.llvm.org/D53580