X compilebench: Rework how `tcc -O2` is skipped

Don't continue on `if $CC == tcc` -> instead put actions that are not
appropriate for `tcc -O2` under `if $CC != tcc`. We will add other
actions to that loop - that's the reason.

In preparation to add pystone_pyx.pyx

t/compilebench/doit.sh

@@ -89,10 +89,7 @@ for CC in gcc tcc; do
 	done
 
 	# tcc -O2 does not add anything (tcc accepts -Ox only for compatibility)
-	if [ $CC == tcc ]; then
-		continue
-	fi
-
+	if [ $CC != tcc ]; then
 		for i in `seq $N`; do
 			export TIMEFORMAT="Benchmark${CC}compile+linkO2 1 %R s/op"
 			time compileandlink pystone_pypyx "-O2"
@@ -101,5 +98,7 @@ for CC in gcc tcc; do
 		for i in `seq $N`; do
 			python -c 'import pystone_pypyx as _; _.main()' |pystone2bench ${CC}O2
 		done
+	fi
+
 
 done