Patch: Extract initialization of TargetOptions from CodeGen flags

[Nadav Rotem]

LGTM. 

On Feb 18, 2014, at 8:54 AM, Eli Bendersky <eliben at google.com> wrote:

> Ping!
> 
> 
> On Thu, Feb 13, 2014 at 10:27 AM, Eli Bendersky <eliben at google.com> wrote:
> The same code (~20 lines) for initializing a TargetOptions object from CodeGen cmdline flags is duplicated 4 (yes 4) times in 4 different tools. This patch moves it into a utility function.
> 
> Since the CodeGen/CommandFlags.h file defines cl::opt flags *in a header*, it's a bit of a touchy situation because we should only link them into tools. So this patch puts the init function in the header. Ideas for something better are most welcome!
> 
> PTAL
> Eli
> 
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