RFA: PR c++/10611 arithmetic operations on vectors

[Mark Mitchell]

Aldy Hernandez wrote:
> Hi folks.
> 
> Here's a very old bug that has been present since the C++ rewrite.
> 
> Arithmetic operations (+, -, *, etc) on vectors are currently broken on the 
> C++ front-end.  Here is a patch to fix them.  Tests are currently running
> on ppc-linux, but this fixes the PR and a few other cases I found.
> 
> If this is ok, I'd like permission to apply to 3.4, 4.0, and mainline.

Jason has approved this, but please do not apply to 4.0 until the freeze 
is liften.

Thanks,

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Mark Mitchell
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