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

The ACLE specifies the C intrinsic 'vshll_n to have a valid immediate
range size of [0..eltsize] but it has a range of [0..((eltsize*2) - 1)].
Update the range check to match the specified behavior

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Co-authored-by: Lukacma <Marian.Lukac@arm.com>
GitOrigin-RevId: 958a9bb29958bef1866a18d4bde0c4e7aabe1ac7
1 file changed