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[cc1] Remove PASSTHROUGH comments

Thanks to dwmuser to remind me that I had to remove these stupid
comments that only are useful for people like him. Remember,
break is a hint to indicate that its not doing a PASSTHROUGH.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -257,7 +257,6 @@

 		case PTR:

 			if (oldtp->op == FLOAT || !cmpnode(np, 0) && !iscast)

 				return NULL;

-			/* PASSTHROUGH */

 		case INT:

 		case FLOAT:

 		case ENUM:

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -330,7 +330,6 @@

 	case TYPEIDEN:

 		if (ahead() == ':')

 			goto parse_stmt;

-		/* PASSTHROUGH */

 	case TYPE:

 	case TQUALIFIER:

 	case SCLASS:

--- a/cc1/types.c

+++ b/cc1/types.c

@@ -136,7 +136,6 @@

 			goto invalid_type;

 		return booltype;

 	case 0:

-		/* fallthrough */

 	case INT:

 		switch (size) {

 		case 0:

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

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

@@ -118,7 +118,7 @@

 		return tool;

 	switch (tool) {

-	case CC1: /* FALLTHROUGH */

+	case CC1:

 	case CC2:

 		fmt = (qbe(tool)) ? "%s-qbe_%s-%s" : "%s-%s-%s";

 		n = snprintf(t->bin, sizeof(t->bin), fmt, t->cmd, arch, abi);

--- a/lib/c/src/vfprintf.c

+++ b/lib/c/src/vfprintf.c

@@ -64,7 +64,6 @@

 				s = va_arg(va, char *);

 				while ((c = *s++) != '\0')

 					putc(c, fp);

-				/* passthrou */

 			default:

 				continue;

 			}