[clang] [Clang][ARM] Fix immediate range for NEON widening left-shifts (PR #212459)

[Kieran B via cfe-commits]

kieroxide wrote:

@davemgreen vshll_n_u32(X, 32) produces the same output as before since llvm allowed 0..(elt*2)-1. We can see already existing tests for this exact case in test/CodeGen/AArch64/neon-misc.c. However, the IR to asm testing is lacking and I will add this to the PR.

https://github.com/llvm/llvm-project/pull/212459