Makefile: Add graphite optimizations

Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>
Makefile: remove -funswitch-loops

Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>
Makefile: More flags

Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>
Makefile: even moar

Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>