cmd/internal/obj: remove unused Pciter type

Change-Id: Ie8323cfcd1193f390729d0d3dd67863aedf47d13
Reviewed-on: https://go-review.googlesource.com/21906
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/internal/obj/link.go

@@ -600,19 +600,6 @@ type Pcdata struct {
 	P []byte
 }
 
-// Pcdata iterator.
-//      for(pciterinit(ctxt, &it, &pcd); !it.done; pciternext(&it)) { it.value holds in [it.pc, it.nextpc) }
-type Pciter struct {
-	d       Pcdata
-	p       []byte
-	pc      uint32
-	nextpc  uint32
-	pcscale uint32
-	value   int32
-	start   int
-	done    int
-}
-
 // symbol version, incremented each time a file is loaded.
 // version==1 is reserved for savehist.
 const (