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/elvisBreakInsideDoWhile.kt

@@ -0,0 +1,10 @@
+public fun foo(x: String?): Int {
+    do {
+        // After the check, smart cast should work
+        x ?: break
+        // x is not null in both branches
+        <!DEBUG_INFO_SMARTCAST!>x<!>.length()
+    } while (true)
+    // x is null because of the break
+    return x<!UNSAFE_CALL!>.<!>length()
+}