Review fixes for smart casts in / out loops.

LoopTypeInfo became TypeInfoWithJumpInfo rewritten in Kotlin.
Fixed a bug with break inside Elvis inside a loop, a pack of related tests added.
isTrueConstant moved to JetPsiUtil.

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

@@ -0,0 +1,9 @@
+public fun foo(x: String?, y: String?): Int {
+    while (true) {
+        (if (x != null) break else y) ?: y!!
+        // x is not null in both branches
+        <!DEBUG_INFO_SMARTCAST!>y<!>.length()
+    }
+    // y can be null because of the break
+    return y<!UNSAFE_CALL!>.<!>length()
+}