FIR DFA: slightly refactor smart cast state tracking

Instead of always looking up smart casts on `lastNode` and separately
tracking the receiver state, simply track which flow the smart casts
belong to right now. This tracked flow is auto-advanced when new
`lastNode`s are created, but can be manually rolled back for things like
KT-63709.

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/resolver/resolverUtils.kt

@@ -58,10 +58,7 @@ internal open class StubBodyResolveTransformerComponents(
             override fun receiverUpdated(symbol: FirBasedSymbol<*>, info: TypeStatement?) =
                 error("Should not be called")
 
-            override fun getTypeUsingSmartcastInfo(
-                expression: FirExpression,
-                ignoreCallArguments: Boolean,
-            ): Pair<PropertyStability, MutableList<ConeKotlinType>>? =
+            override fun getTypeUsingSmartcastInfo(expression: FirExpression): Pair<PropertyStability, MutableList<ConeKotlinType>>? =
                 null
         }
 }