[PATCH] Protection against stack-based memory corruption errors using SafeStack: Clang command line option and function attribute

[Kostya Serebryany]

I'd like Alexey to co-review the clang part.

A top-level comment so far: don't we want to have the flag as -f[no-]sanitize=safe_stack?
This will make it consistent with the rest of sanitizers, including cfi


http://reviews.llvm.org/D6095

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