cmd/link: remove Linklookup & Linkrlookup

Change-Id: I25d9f74cb52e6fd4f2ad4b1c8b7102efadbc7481
Reviewed-on: https://go-review.googlesource.com/29344
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/link/internal/ld/ldelf.go

@@ -1070,7 +1070,7 @@ func readelfsym(ctxt *Link, elfobj *ElfObj, i int, sym *ElfSym, needSym int) (er
 				// local names and hidden global names are unique
 				// and should only be referenced by their index, not name, so we
 				// don't bother to add them into the hash table
-				s = linknewsym(ctxt, sym.name, ctxt.Syms.Version)
+				s = ctxt.Syms.newsym(sym.name, ctxt.Syms.Version)
 
 				s.Type |= obj.SHIDDEN
 			}

src/cmd/link/internal/ld/sym.go

@@ -132,16 +132,3 @@ func (ctxt *Link) computeTLSOffset() {
 	}
 
 }
-
-func linknewsym(ctxt *Link, name string, v int) *Symbol {
-	return ctxt.Syms.newsym(name, v)
-}
-
-func Linklookup(ctxt *Link, name string, v int) *Symbol {
-	return ctxt.Syms.Lookup(name, v)
-}
-
-// read-only lookup
-func Linkrlookup(ctxt *Link, name string, v int) *Symbol {
-	return ctxt.Syms.ROLookup(name, v)
-}