[llvm] r185716 - Add a higher level createTemporaryFile function.

[Rafael Espíndola]

> When Suffix == "", this creates a file with a trailing '.', and while there is nothing functionally wrong with this, it does look a bit odd. Do you think that we could make this:
>
> Prefix + "-%%%%%%" + (Suffix.empty() ? StringRef("") : StringRef(".")) + Suffix
>
> Or something similar instead?

Sure, what do you think of the attached patch?

Cheers,
Rafael
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