[pencil] Add restrict keywork for pointers
[pencil] Add restrict keywork for pointers


Former-commit-id: 5ed3e6747f778d17a596e31683e54acafd019ffe
rbaghdadi/pencil-benchmark,rbaghdadi/pencil-benchmark,dividiti/pencil-benchmark,dividiti/pencil-benchmark,dividiti/pencil-benchmark,pencil-language/pencil-benchmark,pencil-language/pencil-benchmark,rbaghdadi/pencil-benchmark,pencil-language/pencil-benchmark