Preliminary declaration visitor for estimating local variable's predictability for smart casts

Predictability estimation algorithm is completely new, but backward compatibility should present.
A large set of tests. Some updated tests.
Smart casts allowed for captured variables if they are not modified in closure #KT-9051 Fixed
Also #KT-8643 Fixed
Also #KT-7976 Fixed
Correct handling of lambda arguments in functions #KT-9143 Fixed

compiler/testData/diagnostics/tests/smartCasts/lambdaAndArgumentFun.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -NOTHING_TO_INLINE
+// See KT-9143: smart cast on a variable nulled inside a lambda argument
+inline fun <T> foo(t1: T, t2: T) = t1 ?: t2
+
+inline fun <T> bar(<!UNUSED_PARAMETER!>l<!>: (T) -> Unit): T = null!!
+
+fun use() {
+    var x: Int?
+    x = 5
+    // Write to x is AFTER
+    <!DEBUG_INFO_SMARTCAST!>x<!>.hashCode()
+    // No smart cast should be here!
+    foo(bar { x = null }, <!SMARTCAST_IMPOSSIBLE!>x<!>.hashCode())
+}