cmd/5l, cmd/6l, cmd/8l: put floating point numbers in .rodata section

R=golang-dev, rsc
CC=0xe2.0x9a.0x9b, golang-dev
https://golang.org/cl/6742063

src/cmd/5l/obj.c

@@ -688,7 +688,7 @@ loop:
 			sprint(literal, "$%ux", ieeedtof(&p->from.ieee));
 			s = lookup(literal, 0);
 			if(s->type == 0) {
-				s->type = SBSS;
+				s->type = SRODATA;
 				adduint32(s, ieeedtof(&p->from.ieee));
 				s->reachable = 0;
 			}
@@ -710,7 +710,7 @@ loop:
 				p->from.ieee.l, p->from.ieee.h);
 			s = lookup(literal, 0);
 			if(s->type == 0) {
-				s->type = SBSS;
+				s->type = SRODATA;
 				adduint32(s, p->from.ieee.l);
 				adduint32(s, p->from.ieee.h);
 				s->reachable = 0;

src/cmd/6l/obj.c

@@ -682,7 +682,7 @@ loop:
 			sprint(literal, "$%ux", ieeedtof(&p->from.ieee));
 			s = lookup(literal, 0);
 			if(s->type == 0) {
-				s->type = SDATA;
+				s->type = SRODATA;
 				adduint32(s, ieeedtof(&p->from.ieee));
 				s->reachable = 0;
 			}
@@ -716,7 +716,7 @@ loop:
 				p->from.ieee.l, p->from.ieee.h);
 			s = lookup(literal, 0);
 			if(s->type == 0) {
-				s->type = SDATA;
+				s->type = SRODATA;
 				adduint32(s, p->from.ieee.l);
 				adduint32(s, p->from.ieee.h);
 				s->reachable = 0;

src/cmd/8l/obj.c

@@ -675,7 +675,7 @@ loop:
 			sprint(literal, "$%ux", ieeedtof(&p->from.ieee));
 			s = lookup(literal, 0);
 			if(s->type == 0) {
-				s->type = SDATA;
+				s->type = SRODATA;
 				adduint32(s, ieeedtof(&p->from.ieee));
 				s->reachable = 0;
 			}
@@ -709,7 +709,7 @@ loop:
 				p->from.ieee.l, p->from.ieee.h);
 			s = lookup(literal, 0);
 			if(s->type == 0) {
-				s->type = SDATA;
+				s->type = SRODATA;
 				adduint32(s, p->from.ieee.l);
 				adduint32(s, p->from.ieee.h);
 				s->reachable = 0;