wcc/cgen: handle def-str field access (.ptr/.len) on Sdef ident

selfhost/cmd/wcc/cgen.ww

@@ -553,6 +553,7 @@ fn fnretlookup(c: *cgen, name: str) *node = {
 
 type defent = struct {
 	dname: str,
+	drhs:  *node,
 	dnext: *defent,
 };
 
@@ -563,6 +564,7 @@ fn collectdefs(c: *cgen, file: *node) void = {
 		if (d.kind == N_DEF) {
 			let e: *defent = amalloc(c.a, 32u64): *defent;
 			e.dname = d.str;
+			e.drhs  = d.rhs;
 			e.dnext = c.defs;
 			c.defs = e;
 		};
@@ -580,6 +582,19 @@ fn deflookup(c: *cgen, name: str) bool = {
 	return false;
 };
 
+// Returns the rhs init node for a top-level `def`, or nil if `name`
+// doesn't name a def. Used by cgdot to inline `.ptr`/`.len` on
+// `def NAME: str = "..."` — those aren't laid out in memory.
+fn deflookuprhs(c: *cgen, name: str) *node = {
+	let e: *defent = c.defs;
+	for (e != nil) {
+		let dn: str = e.dname;
+		if (streq(dn, name)) { return e.drhs; };
+		e = e.dnext;
+	};
+	return nil;
+};
+
 // ---- module-private symbol map --------------------------------------
 //
 // Non-exported top-level decls live in their originating module's