cmd/5c, cmd/6c, cmd/8c: isolate textflag and dataflag

Fixes #5419.

R=golang-dev, dave, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/9241044

src/cmd/5c/txt.c

@@ -139,9 +139,7 @@ gclean(void)
 			continue;
 		if(s->type == types[TENUM])
 			continue;
-		textflag = s->dataflag;
 		gpseudo(AGLOBL, s, nodconst(s->type->width));
-		textflag = 0;
 	}
 	nextpc();
 	p->as = AEND;
@@ -1181,10 +1179,17 @@ gpseudo(int a, Sym *s, Node *n)
 	p->from.type = D_OREG;
 	p->from.sym = s;
 	p->from.name = D_EXTERN;
-	if(a == ATEXT || a == AGLOBL) {
+
+	switch(a) {
+	case ATEXT:
 		p->reg = textflag;
 		textflag = 0;
+		break;
+	case AGLOBL:
+		p->reg = s->dataflag;
+		break;
 	}
+
 	if(s->class == CSTATIC)
 		p->from.name = D_STATIC;
 	naddr(n, &p->to);

src/cmd/6c/txt.c

@@ -158,9 +158,7 @@ gclean(void)
 			continue;
 		if(s->type == types[TENUM])
 			continue;
-		textflag = s->dataflag;
 		gpseudo(AGLOBL, s, nodconst(s->type->width));
-		textflag = 0;
 	}
 	nextpc();
 	p->as = AEND;
@@ -1502,8 +1500,16 @@ gpseudo(int a, Sym *s, Node *n)
 	p->as = a;
 	p->from.type = D_EXTERN;
 	p->from.sym = s;
+
+	switch(a) {
+	case ATEXT:
 		p->from.scale = textflag;
 		textflag = 0;
+		break;
+	case AGLOBL:
+		p->from.scale = s->dataflag;
+		break;
+	}
 
 	if(s->class == CSTATIC)
 		p->from.type = D_STATIC;

src/cmd/8c/txt.c

@@ -146,9 +146,7 @@ gclean(void)
 			continue;
 		if(s->type == types[TENUM])
 			continue;
-		textflag = s->dataflag;
 		gpseudo(AGLOBL, s, nodconst(s->type->width));
-		textflag = 0;
 	}
 	nextpc();
 	p->as = AEND;
@@ -1381,8 +1379,16 @@ gpseudo(int a, Sym *s, Node *n)
 	p->as = a;
 	p->from.type = D_EXTERN;
 	p->from.sym = s;
+
+	switch(a) {
+	case ATEXT:
 		p->from.scale = textflag;
 		textflag = 0;
+		break;
+	case AGLOBL:
+		p->from.scale = s->dataflag;
+		break;
+	}
 
 	if(s->class == CSTATIC)
 		p->from.type = D_STATIC;