Capture flexible intersection types properly: take into account both bounds and use the same captured arguments for them

^KT-41693 Fixed

compiler/testData/codegen/box/inference/subtypingOfIntersectionIltInsideFlexible.kt

@@ -0,0 +1,27 @@
+// IGNORE_BACKEND: JS
+// IGNORE_BACKEND: JS_IR
+
+// FILE: Bar.java
+public class Bar {
+    public static String bar() {
+        return null;
+    }
+}
+
+// FILE: main.kt
+fun foo(): Any? {
+    return if (true) {
+        if (true) {
+            Bar.bar()
+        } else {
+            1
+        }
+    } else {
+        1
+    }
+}
+
+fun box(): String? {
+    foo()
+    return "OK"
+}