[llvm-commits] patch: DSE for str[n]{cat,cpy}

[Nick Lewycky]

This patch extends dead store elimination to treat
strcpy/strncpy/strcat/strncat as stores that can be removed. There are some
more functions we could do this for, such as
sprintf/snprintf/vsprintf/vsnprintf, but TargetLibraryInfo doesn't have
entries for those yet.

The test uses -basicaa to get the target library info, but I don't specify
a triple because at the moment there are no targets which disable strcpy
and friends. Ideas for future-proofing this would be appreciated.

Please review!

Nick
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