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Kristiyan Kostadinov 02edb43067 fix(compiler): narrow the type of the aliased if block expression (#51952 )

Currently the TCB for aliased `if` blocks looks something like this:

```
// Markup: `@if (expr; as alias) { {{alias}} }

if (block.condition) {
  var alias = block.condition;
  "" + alias;
}
```

The problem with this approach is that the type of `alias` won't be narrowed. This is something that `NgIf` currently supports.

These changes resolve the issue by emitting the variable outside the `if` block and using the variable reference instead:

```
// Markup: `@if (expr; as alias) { {{alias}} }

var alias = block.condition;
if (alias) {
  "" + alias;
}
```

PR Close #51952

2023-10-04 08:49:59 -07:00