tree 7121aea7bb73779b8fe45df522ca44e58d4a67ab
parent 20d43d03dd27568f609d621ce44673393e838892
parent 7f0637da5144c7435e88ea3805021882f077d50c
author Tyler Mandry <tmandry@gmail.com> 1568754647 -0700
committer GitHub <noreply@github.com> 1568754647 -0700
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Rollup merge of #64394 - nnethercote:shrink-SubregionOrigin, r=Mark-Simulacrum

Shrink `SubregionOrigin`.

It's currently 120 bytes on x86-64, due to one oversized variant
(`Subtype`). This commit boxes `Subtype`'s contents, reducing the size
of `SubregionOrigin` to 32 bytes.

The change speeds things up by avoiding lots of `memcpy` calls, mostly
relating to `RegionConstraintData::constraints`, which is a `BTreeMap`
with `SubregionOrigin` values.