[clang] [CIR][AArch64] Added vector intrinsics for shift left (PR #187516)

[Andrzej Warzyński via cfe-commits]

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banach-space wrote:

Note, you can safely skip `-NEXT` in `CHECK` directives. That's primarily because we are using LIT variables (e.g. `TMP1`) and those basically dictate the order of instructions. We don't really verify whether there are any other instructions in between - the actual output can be noise (as you observe in your [comment](https://github.com/llvm/llvm-project/pull/187516#issuecomment-4102797668)).

https://github.com/llvm/llvm-project/pull/187516