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[cc1] simplify readline()

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -201,17 +201,11 @@

 		peekc = 0;

 		if (c == '\n' || c == '\0')

 			break;

-		if (c != '/')

+		if (c != '/' || (peekc = readchar()) != '*' && peekc != '/')

 			continue;

-		if ((c = readchar()) != '*' && c != '/') {

-			peekc = c;

-			c = '/';

-		} else {

-			if (c == '/')

-				c = '\n';

-			comment(c);

-			c = ' ';

-		}

+		comment((peekc == '/') ? '\n' : peekc);

+		peekc = 0;

+		c = ' ';

 	}

 	if (bp == lim)