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[driver] add S flag for stopping after assembly output

--- a/driver/posix/scc.c

+++ b/driver/posix/scc.c

@@ -42,7 +42,7 @@

 char *argv0;

 static char *arch;

-static int Eflag, kflag;

+static int Eflag, Sflag, kflag;

 static void

 terminate(void)

@@ -159,13 +159,17 @@

 			ADDARG(tool, file);

 			break;

 		case CC2:

-			out = (!arch || strcmp(arch, "qbe")) ? AS : QBE;

-			if (out != QBE)

-				keepfile = kflag;

+			if (!arch || strcmp(arch, "qbe")) {

+				out = Sflag ? NR_TOOLS : AS;

+				keepfile = (Sflag || kflag);

+			} else {

+				out = QBE;

+				keepfile = Sflag;

+			}

 			break;

 		case QBE:

-			out = AS;

-			keepfile = kflag;

+			out = Sflag ? NR_TOOLS : AS;

+			keepfile = (Sflag || kflag);

 			break;

 		case AS:

 			out = NR_TOOLS;

@@ -207,6 +211,9 @@

 	case 'E':

 		Eflag = 1;

 		ADDARG(CC1, "-E");

+		break;

+	case 'S':

+		Sflag = 1;

 		break;

 	case 'k':

 		kflag = 1;