r196606 - Add option to use temporary file for assembling with clang

[David Peixotto]

> Hi David,
> 
> Could you try Rafael's suggestion to use InternalDebugOpt or HelpHidden?
> 
> The feature is undoubtedly useful for validation but it doesn't need to be
> advertised to end users.

Hi Alp,

I've attached a patch that changes the option name to '-ccc-via-file-asm'
and makes it an InternalDebugOpt. Ok to commit?

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