Cherry-pick different fix for AArch64 truncating FP stores#128

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cuviper merged 2 commits intorust-lang:rustc/13.0-2021-09-30from

nikic:rust-aarch64-backport-2

Jan 25, 2022

Commits on Jan 25, 2022

Revert "[AArch64][GlobalISel] Fix incorrect handling of fp truncating stores."
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[AArch64][GlobalISel] Don't contract cross-bank copies into truncating stores.

aemerson
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nikic
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