system "opt -q -f $ProfilePass $BytecodeFile -o $BytecodeFile.inst";
system "lli -fake-argv0 '$BytecodeFile' -load $LibProfPath " .
system "opt -q -f $ProfilePass $BytecodeFile -o $BytecodeFile.inst";
system "lli -fake-argv0 '$BytecodeFile' -load $LibProfPath " .