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[ARM][AArch64] Add LLVM_FALLTHROUGH to silence warning [NFC]

Description

[ARM][AArch64] Add LLVM_FALLTHROUGH to silence warning [NFC]

A follow up to D52784 to add in LLVM_FALLTHROUGH where there is an
intentional fall through in a switch statement. This will hopefully silence
a GCC warning.

Differential Revision: https://reviews.llvm.org/D52784