fix build
fix build

[ 19%] Building CXX object libcpu/CMakeFiles/cpu.dir/basicblock.cpp.o
/home/op/work/ukatemi/libcpu/libcpu/basicblock.cpp:7:10: fatal error: 'llvm/Constants.h' file not found
 #include "llvm/Constants.h"
         ^
1 error generated.
*** [libcpu/CMakeFiles/cpu.dir/basicblock.cpp.o] Error code 1

Stop in /usr/home/op/work/ukatemi/libcpu.
*** [libcpu/CMakeFiles/cpu.dir/all] Error code 1

ukatemi/libcpu,ukatemi/libcpu,ukatemi/libcpu,ukatemi/libcpu