Don't generate UNNECESSARY_SAFE_CALL on variables of generic type <T: Any?>

compiler/testData/diagnostics/tests/extensions/ExtensionFunctions.kt

@@ -4,7 +4,7 @@ package outer
 fun Int?.optint() : Unit {}
 val Int?.optval : Unit = Unit.VALUE
 
-fun <T, E> T.foo(<!UNUSED_PARAMETER!>x<!> : E, y : A) : T   {
+fun <T: Any, E> T.foo(<!UNUSED_PARAMETER!>x<!> : E, y : A) : T   {
   y.plus(1)
   y plus 1
   y + 1.0

compiler/testData/diagnostics/tests/nullableTypes/safeCallOnTypeWithNullableUpperBound.kt

@@ -0,0 +1,13 @@
+fun <T> test(t: T): String {
+    if (t != null) {
+        return t<!UNNECESSARY_SAFE_CALL!>?.<!>toString()
+    }
+    return t?.toString()
+}
+
+fun <T> T.testThis(): String {
+    if (this != null) {
+        return this<!UNNECESSARY_SAFE_CALL!>?.<!>toString()
+    }
+    return this?.toString()
+}