Integrate and remove Clang hardening instructions
The file contrib/clang/sanitize_blacklist.txt contains instructions on how to build Tor with AddressSanitizer using Clang. Recent changes to the build system made most of these instructions obsolete (see #13538 (moved), #18934 (moved), #18841 (moved)).
FWICT the only thing that is not implemented are some CFLAGS and LDFLAGS options.
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