Hi.

Following patch addresses issue where we have a function argument which address
is taken and -fsanitize=address does not wrap up the argument with red zone.
It's done in sanopt pass, where I create a new automatic variable which is used
in the function instead of the original argument.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
And I can bootstrap-asan on the same machine.

Ready to be installed?
Martin