[v3] PATCH to revert the aliasing problem workaround in function::swap

[Jason Merrill]

With recent improvements in alias analysis, this workaround is no longer 
necessary; I'm restoring the original code that just does union 
assignment so that the testsuite will complain if we start making 
invalid assumptions again.

Tested x86_64-pc-linux-gnu, applied to trunk.
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