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https://reviews.llvm.org/D140192 caused the LLVM variable generated
for enum discriminant checks to be named differently (%narrow vs %1).
This adjusts the test CHECK directives to match any name.
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When doing the optimized implementation of getting the discriminant, the
arithmetic needs to be done in the tag type so wrapping behavior works
correctly.
Fixes #104519
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In some cases we can avoid arithmetic before checking whether a niche
represents an untagged variant.
This is relevant to #101872
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