Turn off BooleanElvisBoundSmartCasts in 1.3

See KT-26357

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/smartcasts/DataFlowInfoImpl.kt

@@ -64,8 +64,7 @@ internal class DataFlowInfoImpl private constructor(
         nullability: Nullability,
         languageVersionSettings: LanguageVersionSettings,
         newTypeInfoBuilder: SetMultimap<DataFlowValue, KotlinType>? = null,
-        // TODO: remove me in version 1.3! I'm very dirty hack!
-        // In normal circumstances this should be always true
+        // XXX: set to false only as a workaround for OI, see KT-26357 for details (in NI everything works automagically)
         recordUnstable: Boolean = true
     ) {
         if (value.isStable || recordUnstable) {

compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt

@@ -57,7 +57,6 @@ enum class LanguageFeature(
     ExpectedTypeFromCast(KOTLIN_1_2),
     DefaultMethodsCallFromJava6TargetError(KOTLIN_1_2),
 
-    BooleanElvisBoundSmartCasts(KOTLIN_1_3),
     RestrictionOfValReassignmentViaBackingField(KOTLIN_1_3, kind = BUG_FIX),
     NestedClassesInEnumEntryShouldBeInner(KOTLIN_1_3, kind = BUG_FIX),
     ProhibitDataClassesOverridingCopy(KOTLIN_1_3, kind = BUG_FIX),
@@ -104,6 +103,8 @@ enum class LanguageFeature(
     MultiPlatformProjects(sinceVersion = null, defaultState = State.DISABLED),
 
     NewInference(sinceVersion = KOTLIN_1_3, defaultState = State.DISABLED),
+    // This feature can be enabled only along with new inference, see KT-26357 for details
+    BooleanElvisBoundSmartCasts(sinceVersion = KOTLIN_1_3, defaultState = State.DISABLED),
 
     SamConversionForKotlinFunctions(sinceVersion = KOTLIN_1_3, defaultState = State.DISABLED),