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[AArch64][GlobalISel] Promote scalar G_SHL constant shift amounts to …
…s64. This was supposed to be done in the first place as is currently the case for G_ASHR and G_LSHR but was forgotten when the original shift legalization overhaul was done last year. This was exposed because we started falling back on s32 = s32, s64 SHLs due to a recent combiner change. Gives a very minor (0.1%) code size -O0 improvement on consumer-typeset.
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