[Patch] Add option ftree-stdarg-opt

[Tom de Vries]

Hi,

this patch adds option ftree-stdarg-opt, which switches pass_stdarg on or off.

Pass_stdarg does an optimization on cfun->va_list_gpr/fpr_size, and since it's 
an optimization, it's useful to be able to switch it off in case of a problem 
with the pass.

This is not a regression or documentation fix, so it doesn't classify as a stage 
4 patch. I could imagine it still being included in stage4 because it adds the 
possibility for a workaround in case of problems.

Bootstrapped and reg-tested on x86_64.

OK for stage1 (or even stage 4)?

Thanks,
- Tom
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