Auto merge of #120080 - cuviper:128-align-packed, r=nikic

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Pack u128 in the compiler to mitigate new alignment

This is based on #116672, adding a new `#[repr(packed(8))]` wrapper on `u128` to avoid changing any of the compiler's size assertions. This is needed in two places:

* `SwitchTargets`, otherwise its `SmallVec<[u128; 1]>` gets padded up to 32 bytes.
* `LitKind::Int`, so that entire `enum` can stay 24 bytes.
  * This change definitely has far-reaching effects though, since it's public.

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bors 2024-01-22 13:08:19 +00:00

parent 3e57ae43b9 8fc7e56cdc

commit 2e5aca322f

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