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[cc1] Improve ones()

This function is inspired in the function getbits() of k&r.

--- a/cc1/fold.c

+++ b/cc1/fold.c

@@ -9,11 +9,7 @@

 TUINT

 ones(int nbytes)

 {

-	TUINT v;

-

-	for (v = 0; nbytes--; v |= 255)

-		v <<= 8;

-	return v;

+	return (nbytes == 8) ? -1 : ~(-1ull << nbytes * 8);

 }

 static int