Revert "cmd/compile: define func value symbols at declaration"

This reverts commit 3b411bf1a1bb08d6868083981cecba8088dc7aea.

Change-Id: I321a43fa378a43b3e4d7aa97e0222775640af64b
Reviewed-on: https://go-review.googlesource.com/12205Reviewed-by: Russ Cox <rsc@golang.org>

src/cmd/compile/internal/gc/closure.go

@@ -199,7 +199,6 @@ func makeclosure(func_ *Node) *Node {
 	xfunc.Func.Nname.Name.Funcdepth = func_.Func.Depth
 	xfunc.Func.Depth = func_.Func.Depth
 	xfunc.Func.Endlineno = func_.Func.Endlineno
-	makefuncsym(xfunc.Func.Nname.Sym)
 
 	xfunc.Nbody = func_.Nbody
 	xfunc.Func.Dcl = concat(func_.Func.Dcl, xfunc.Func.Dcl)

src/cmd/compile/internal/gc/dcl.go

@@ -585,10 +585,6 @@ func funchdr(n *Node) {
 		Fatal("funchdr: dclcontext")
 	}
 
-	if importpkg == nil && n.Func.Nname != nil {
-		makefuncsym(n.Func.Nname.Sym)
-	}
-
 	dclcontext = PAUTO
 	markdcl()
 	Funcdepth++
@@ -1493,16 +1489,12 @@ func funcsym(s *Sym) *Sym {
 	}
 
 	s1 := Pkglookup(s.Name+"·f", s.Pkg)
-	s.Fsym = s1
-	return s1
-}
-
-func makefuncsym(s *Sym) {
-	if isblanksym(s) {
-		return
-	}
-	s1 := funcsym(s)
+	if s1.Def == nil {
 		s1.Def = newfuncname(s1)
 		s1.Def.Func.Shortname = newname(s)
 		funcsyms = list(funcsyms, s1.Def)
+	}
+	s.Fsym = s1
+
+	return s1
 }