[test infra] Add a directive for type checking utils that use @Exact

compiler/testData/diagnostics/helpers/types/checkTypeWithExact.kt

@@ -0,0 +1,4 @@
+@Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+fun <T> checkExactType(expr: @kotlin.internal.Exact T) {}
+@Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+fun <T> checkTypeEquality(reference: @kotlin.internal.Exact T, expr: @kotlin.internal.Exact T) {}

compiler/testData/diagnostics/tests/checkTypeWithExactTest.fir.kt

@@ -0,0 +1,14 @@
+// CHECK_TYPE_WITH_EXACT
+
+open class A
+open class B: A()
+class C: B()
+
+fun test(expr: B) {
+    checkExactType<A>(<!ARGUMENT_TYPE_MISMATCH!>expr<!>)
+    checkExactType<B>(expr)
+    checkExactType<C>(<!ARGUMENT_TYPE_MISMATCH!>expr<!>)
+    checkTypeEquality(A(), <!ARGUMENT_TYPE_MISMATCH!>expr<!>)
+    checkTypeEquality(B(), expr)
+    checkTypeEquality(C(), <!ARGUMENT_TYPE_MISMATCH!>expr<!>)
+}

compiler/testData/diagnostics/tests/checkTypeWithExactTest.kt

@@ -0,0 +1,14 @@
+// CHECK_TYPE_WITH_EXACT
+
+open class A
+open class B: A()
+class C: B()
+
+fun test(expr: B) {
+    checkExactType<A>(<!TYPE_MISMATCH!>expr<!>)
+    checkExactType<B>(expr)
+    checkExactType<C>(<!TYPE_MISMATCH!>expr<!>)
+    checkTypeEquality(A(), <!TYPE_MISMATCH!>expr<!>)
+    checkTypeEquality(B(), expr)
+    checkTypeEquality(C(), <!TYPE_MISMATCH!>expr<!>)
+}