[PATCH] Fix PR c++/14024, missing aliasing-warnings for C++

[Mark Mitchell]

Richard Guenther wrote:
> This enables the C++ frontend to warn about possible strict-aliasing
> issues, like the C frontend does.
> 
> Bootstrapped and regtested on x86_64-unknown-linux-gnu.
> 
> Ok for mainline?

OK.

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Mark Mitchell
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