[llvm] [AArch64][GlobalISel] Select SHL({Z|S}EXT, DUP Imm) into {U|S}HLL Imm (PR #96782)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

The patterns LGTM once the other patch goes in.

https://github.com/llvm/llvm-project/pull/96782