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Joe Savona
894cf6e37b
We previously represented JsxExpressions using builtin tags - `<div>`, `<b>` etc
- by lowering the tag name to a Primitive with the string name of the tag.
However, by lowering into an independent value, it was possible that the lowered
tag name could be grouped into a different memo slot, such that we ended up with
output like:
```javascript
let t0;
if (c_1) {
...
t0 = "div"
...
} else { ... }
return <t0>{children}</t0>
```
This is obviously wrong. It's also wrong to rename `t0` -> `T0`, because React
treats that as a custom component, not a builtin. The right thing is to
explicitly model builtin components, which this PR does by making
`JsxExpression.tag` be a union of Place | BuiltinTag.