Allow the no_stack_protector attribute on local variables (#173311) This attribute is currently only permitted on functions, but sometimes it can be useful to opt out a specific local variable. That way the function can still get a stack protector if other locals require it, but locals which are opted out won't have the overhead of a stack protector if not needed. This is paired with an LLVM change which has already landed, which uses the new metadata to opt specific alloca instructions out of requiring a stack protector.
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