Rollup merge of #76389 - MaulingMonkey:pr-natvis-hashmap-vsc, r=petrochenkov
Rollup merge of #76389 - MaulingMonkey:pr-natvis-hashmap-vsc, r=petrochenkov

Fix HashMap visualizers in Visual Studio (Code)

CDB (as used in unit tests) doesn't care that we're using static_cast between unrelated types (`u8*` to `tuple<$T1, $T2>*`).
Visual Studio & Visual Studio Code care.  These should've been reinterpret_cast or C casts.

Credit to @petrochenkov per https://github.com/rust-lang/rust/issues/76352 for helping catch this.

### Testing

```cmd
x.py test --stage 1 src/tools/tidy
x.py test --stage 1 --build x86_64-pc-windows-msvc src\test\debuginfo
```

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust