Martin Storsjö 485432f3c8 [ARM] Make a narrow tMOVi8 where possible in SEH prologues
We intentionally disable Thumb2SizeReduction for SEH
prologues/epilogues, to avoid needing to guess what will happen with
the instructions in a potential future pass in frame lowering.

But for this specific case, where we know we can express the
intent with a narrow instruction, change to that instruction form
directly in frame lowering.

Differential Revision: https://reviews.llvm.org/D126949
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