Rollup merge of #88691 - hyd-dev:88649, r=Mark-Simulacrum

Rollup merge of #88691 - hyd-dev:88649, r=Mark-Simulacrum

Add a regression test for #88649

I noticed that #88649 does not have a regression test, so I add one in this PR.

The test fails with this without #88678:
```
error[E0080]: evaluation of constant value failed
  --> /checkout/src/test/ui/consts/issue-88649.rs:13:52
   |
LL |             Foo::Variant1(x) | Foo::Variant2(x) if x => {}
   |                                                    ^ StorageLive on a local that was already live

error: aborting due to previous error

For more information about this error, try `rustc --explain E0080`.
```