OPTFLAG(EXCEPTION,20, "exception", "Optimize exception catch blocks")
OPTFLAG(SSA ,21, "ssa", "Use plain SSA form")
OPTFLAG(TREEPROP ,22, "treeprop", "Tree propagation")
+OPTFLAG(SSE2 ,23, "sse2", "SSE2 instructions on x86")
+OPTFLAG(GSHARED ,24, "gshared", "Share generics")