Erase non-reified type parameters by-default when inlining.

Substitution of type arguments to non-reified type parameters may lead
to accidental reification, which should not be done (see ^KT-60174 for
examples). So, we should erase them, except the few cases.

^KT-60174: Fixed
^KT-60175: Fixed

compiler/testData/codegen/boxInline/special/blockReturnsNullableUnit.kt

@@ -0,0 +1,15 @@
+// FILE: 1.kt
+
+inline fun <T: Unit?> myrun(block: () -> T) = block()
+
+// FILE: 2.kt
+
+fun box(): String {
+    var x = "Fail"
+    myrun L@{
+        if (false) return@L Unit
+        x = "OK"
+        null
+    }
+    return x
+}