Deprecate simplification of complex boolean constant expressions in whens and loops

^KT-39883 In Progress

compiler/testData/diagnostics/tests/smartCasts/loops/whileTrivial.fir.kt

@@ -0,0 +1,12 @@
+// LANGUAGE: -ProhibitSimplificationOfNonTrivialConstBooleanExpressions
+fun x(): Boolean { return true }
+
+public fun foo(p: String?): Int {
+    // Like whileTrue but 2 == 2 is in use
+    while(2 == 2) {
+        p!!.length
+        if (x()) break
+    }
+    // Smart cast should not work in this case, see KT-6284
+    return p<!UNSAFE_CALL!>.<!>length
+}

compiler/testData/diagnostics/tests/smartCasts/loops/whileTrivial.kt

@@ -1,12 +1,12 @@
-// FIR_IDENTICAL
+// LANGUAGE: -ProhibitSimplificationOfNonTrivialConstBooleanExpressions
 fun x(): Boolean { return true }
 
 public fun foo(p: String?): Int {
     // Like whileTrue but 2 == 2 is in use
-    while(2 == 2) {
+    while(<!NON_TRIVIAL_BOOLEAN_CONSTANT!>2 == 2<!>) {
         p!!.length
         if (x()) break
     }
     // Smart cast should not work in this case, see KT-6284
     return p<!UNSAFE_CALL!>.<!>length
-}
+}