Allow including keyword.h multiple times
Allow including keyword.h multiple times

shinh/elvm,shinh/elvm,ND-CSE-30151/elvm,shinh/elvm,shinh/elvm,shinh/elvm,ND-CSE-30151/elvm,shinh/elvm,shinh/elvm,ND-CSE-30151/elvm,shinh/elvm