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a061befb46
It seems that this was added to allow rustc to load proc macros that had been compiled with UBSan enabled, which zig does for debug and `ReleaseSafe` builds. When zig drives the link of the final binary it knows to include the ubsan runtime, but our zig-built artifacts are being linked into a binary whose linking rustc drives. This removes the libubsan workaround we have and replaces it with `-fno-sanitize=undefined` passed to zig. The new argument is passed at the end of zig's args so should take precedence over any earlier arguments from the script's caller.
