Fix crash caused by assertion with evolving array type (#38398)

* Properly finalize evolving array type in getTypeAtFlowCall

* Add regression test

tests/cases/compiler/evolvingArrayTypeInAssert.ts

@@ -0,0 +1,10 @@
+// @strict: true
+
+export function unsafeCast<T>(_value: unknown): asserts _value is T { }
+
+function yadda() {
+    let out = [];
+    out.push(100)
+    unsafeCast<any>(out);
+    return out;
+}