[C++ Patch] PR 90909 ("[10 Regression] call devirtualized to pure virtual")

[Paolo Carlini]

... so, now that I see the issue more clearly, I'm adding to the 
testsuite the below too.

Thanks, Paolo.

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Index: final7.C
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--- final7.C	(nonexistent)
+++ final7.C	(working copy)
@@ -0,0 +1,11 @@
+// PR c++/90909
+// { dg-do run { target c++11 } }
+
+#include <cassert>
+
+struct S1 { virtual bool f() { return false; } };
+struct S2: S1 { virtual bool f() { return true; } };
+struct S3: S2 { using S1::f; };
+struct S4 final: S3 { void g(); };
+void S4::g() { assert (f() == true); }
+int main() { S4().g(); }