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[PATCH][RFA/RFC] Stack clash mitigation patch 00/08 V2


So later than I wanted, here's the V2 of the stack clash mitigation work.

Probably the biggest change in this version was moving the protection
out of -fstack-check= and into its own option (-fstack-clash-protection)

This has been bootstrapped and regression tested on the same set of
targets {x86_64, powerpc, powerpc64le, aarch64, s390x}-linux-gnu.  I've
also enabled -fstack-clash-protection and eyeballed test results
relative to the baselines to ensure nothing unexpected was failing.

Since this patch hits other targets that are not protected from
stack-clash a little harder, I also tested things like {alpha, mips,
ia64, hppa}-linux-gnu through building all-gcc.

As with the prior patch, comments, flames, questions are welcomed.

Jeff


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