[NI] Avoid constraints from expected type for effectively empty system

Expression will be checked against expected type later.

 Theoretically, this is not very good, but it aligns with the old
 inference, plus it helps avoiding multiple type mismatch diagnostics.

compiler/testData/diagnostics/tests/scopes/inheritance/methodsPriority.kt

@@ -20,7 +20,7 @@ fun test() {
 
     class B: A() {
         init {
-            val a: Int = <!NI;TYPE_MISMATCH, TYPE_MISMATCH!>foo()<!> // todo
+            val a: Int = <!TYPE_MISMATCH!>foo()<!> // todo
         }
     }
 }

compiler/testData/diagnostics/tests/scopes/inheritance/statics/companionObject/inheritFromContainingClass_after.kt

@@ -12,14 +12,14 @@ open class A<T> : J() {
     init {
         foo()
         bar()
-        val a: Int = <!NI;TYPE_MISMATCH, TYPE_MISMATCH!><!DEBUG_INFO_LEAKING_THIS!>baz<!>()<!>
+        val a: Int = <!TYPE_MISMATCH!><!DEBUG_INFO_LEAKING_THIS!>baz<!>()<!>
         val b: T = <!DEBUG_INFO_LEAKING_THIS!>baz<!>()
     }
 
     fun test1() {
         foo()
         bar()
-        val a: Int = <!NI;TYPE_MISMATCH, TYPE_MISMATCH!>baz()<!>
+        val a: Int = <!TYPE_MISMATCH!>baz()<!>
         val b: T = baz()
     }
 

compiler/testData/diagnostics/tests/scopes/inheritance/statics/companionObject/inheritFromContainingClass_before.kt

@@ -12,14 +12,14 @@ open class A<T> : J() {
     init {
         <!DEPRECATED_ACCESS_BY_SHORT_NAME!>foo()<!>
         bar()
-        val a: Int = <!NI;TYPE_MISMATCH, TYPE_MISMATCH!><!DEBUG_INFO_LEAKING_THIS!>baz<!>()<!>
+        val a: Int = <!TYPE_MISMATCH!><!DEBUG_INFO_LEAKING_THIS!>baz<!>()<!>
         val b: T = <!DEBUG_INFO_LEAKING_THIS!>baz<!>()
     }
 
     fun test1() {
         <!DEPRECATED_ACCESS_BY_SHORT_NAME!>foo()<!>
         bar()
-        val a: Int = <!NI;TYPE_MISMATCH, TYPE_MISMATCH!>baz()<!>
+        val a: Int = <!TYPE_MISMATCH!>baz()<!>
         val b: T = baz()
     }
 

compiler/testData/diagnostics/tests/scopes/inheritance/statics/localVsStatic.kt

@@ -21,7 +21,7 @@ fun test() {
 
     class B: A() {
         init {
-            val a: Int = <!NI;TYPE_MISMATCH, TYPE_MISMATCH!>foo()<!> // todo
+            val a: Int = <!TYPE_MISMATCH!>foo()<!> // todo
         }
     }
 }