[PATCH] handle fallout from attributes patch (PR 84617)

[Martin Sebor]

The attached patch fixes the regressions in merging attributes
on ordinary functions introduced by yesterday's commit to fix
bug 83871.  I've also added a new test to exercise the malloc
bit even better (this is test #3 for a single bit).

I have xfailed for now the remaining failures that expose
the bug where attributes on multiple declarations of the same
template function are not merged.  I'm assuming this being
tracked in bug 84294.  I'll look into it next but I want to
get the regressions resolved quickly.

A full bootstrap/regression test run is in progress.

Martin
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