Do not annotate bare type parameters as @Nullable

This is to account for the case of, say

     class Function<R> { fun invoke(): R }

it would be a shame to put @Nullable on the return type of the function, and force all callers to check for null,
so we put no annotations

compiler/testData/asJava/nullabilityAnnotations/Generic.java

@@ -0,0 +1,12 @@
+public interface Generic <N, NN>  extends jet.JetObject {
+    N a(@jet.runtime.typeinfo.JetValueParameter(name = "n") N n);
+
+    @org.jetbrains.annotations.NotNull
+    NN b(@org.jetbrains.annotations.NotNull @jet.runtime.typeinfo.JetValueParameter(name = "nn") NN nn);
+
+    @org.jetbrains.annotations.Nullable
+    N a1(@org.jetbrains.annotations.Nullable @jet.runtime.typeinfo.JetValueParameter(name = "n", type = "?") N n);
+
+    @org.jetbrains.annotations.Nullable
+    NN b1(@org.jetbrains.annotations.Nullable @jet.runtime.typeinfo.JetValueParameter(name = "nn", type = "?") NN nn);
+}