sjeng with O2 optimization can not pass instrument

[cclinus]

458.sjeng is from spec suite. LLFI works with O0 opt, but not O2 opt.

Contact me for sjeng.ll if you can not compile it from spec.

[nankmr2012]

@cclinus
Hi Justin, can you please elaborate this issue with more clarity?
Thanks
Nanda Kumar

[cclinus]

To reproduce:

1. Take sjeng benchmark from spec06 and compile sjeng to a single LLVM IR file with -O2 flag.
2. Run LLFI.

You will see LLFI stops at first instrumentation pass.