[FIR] Implement new bound smartcast algorithm

#KT-36055 Fixed

compiler/testData/diagnostics/tests/smartCasts/varnotnull/forEach.fir.kt

@@ -9,8 +9,8 @@ fun list(start: SomeObject): SomeObject {
     var e: SomeObject? = start
     for (i in 0..42) {
         // Unsafe calls because of nullable e at the beginning
-        e.<!INAPPLICABLE_CANDIDATE!>doSomething<!>()
-        e = e.<!INAPPLICABLE_CANDIDATE!>next<!>()
+        e.doSomething()
+        e = e.next()
     }
     // Smart cast is not possible here due to next()
     return e