Patch: Extract initialization of TargetOptions from CodeGen flags

[Eli Bendersky]

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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