refact(es/minifier): merge cond_init with reassigned

[Austaras]

Description:

And optimize following sutiation

export function genElement(el, state) {
    if ('slot' === el.tag) return el1 = el, genChildren(el1);
    if (el.component) {
        var el1
        return 999;
    }
}

which rarely happens in hand written JS, but is often generated by swc merge variable pass

BREAKING CHANGE:

Related issue (if exists):

[kdy1]

Thank you!

---

swc-bump:

• swc_ecma_usage_analyzer --breaking

[kdy1]

Thanks!