zig cc ubsan

[marler8997]

Right now zig cc uses the following options.

-fsanitize=undefined -fsanitize-trap=undefined

This enables ubsan (undefined behavior sanitization) which means at runtime the program will check for undefined behavior. The -fsanitize-trap=undefined option is used when the sanitizer runtime is unavailable, and seems to result in "illegal instruction" errors rather than nice easy-to-debug panics (i.e. #9701).

I propose that Zig implement or include the ubsan runtime and by default have it print stack traces like a normal zig panic would do.

[alexrp]

#5163