New J2K: separate nullability inference from common one & nullability bug fixes

It will be needed for structure mutability inference

#KT-21467 fixed
#KT-32609 fixed
#KT-32572 fixed
#KT-24677 fixed

nj2k/testData/inference/nullability/spreadExpression.kt

@@ -0,0 +1,9 @@
+import java.lang.reflect.Constructor
+
+fun <T> foo(constructor: /*T1@*/Constructor</*T0@*/T>, args: /*T3@*/Array</*T2@*/Any?>) {
+    constructor/*T1@Constructor<T0@T>*/.newInstance(*args/*T3@Array<T2@Any>*/)
+}
+
+//T3 := LOWER due to 'USE_AS_RECEIVER'
+//T0 := T0 due to 'RECEIVER_PARAMETER'
+//T1 := LOWER due to 'USE_AS_RECEIVER'