[PATCH] Add -disable-opt option to LTO

[Cristiano Giuffrida]

Hi,
the attached patch adds the -disable-opt option to LTO. The effect is
self-explanatory. I think this should be considered for merging
(hopefully for the upcoming 3.3 release) for the following reasons:

- Consistency with opt (which supports the same option with the same
meaning and description).
- Debugging gold plugin-based linking without optimizations getting in the way.
- Debugging programs linked with the gold plugin while preserving the
original debug info.
- Fine-grained control over LTO passes using the gold plugin in
combination with opt (or clang/dragonegg).

Thanks,

Cristiano
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