patch: add a driver flag to turn on function merging optimization

[Nick Lewycky]

Sorry, I failed to "svn add" the new test and include it in the patch.
Here's an updated patch with the test in it.

On 23 October 2014 14:39, Nick Lewycky <nlewycky at google.com> wrote:

> The attached patch adds -fmerge-functions which is in turn attached to
> PassManagerBuilder::MergeFunctions. This is provided for testing it out,
> and we can decide what we want the default to be after we have experience.
> Note that it does bad things to debug info which doesn't currently have a
> way to represent which function got called if two functions were merged.
>
> Please review!
>
> Nick
>
>
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