Revert "cmd/compile: discard duplicate inline method bodies"

This reverts commit f0b36269.

Reason for revert: this change caused the runtime tests on all linux/amd64 and linux/386 builders to timeout

Change-Id: Idf8cfdfc84540e21e8da403e74df5596a1d9327b
Reviewed-on: https://go-review.googlesource.com/54490Reviewed-by: Matthew Dempsky <mdempsky@google.com>

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

@@ -484,7 +484,6 @@ func (p *importer) typ() *types.Type {
 
 		t = pkgtype(p.imp, tsym)
 		p.typList = append(p.typList, t)
-		dup := !t.IsKind(types.TFORW) // type already imported
 
 		// read underlying type
 		t0 := p.typ()
@@ -515,19 +514,10 @@ func (p *importer) typ() *types.Type {
 			result := p.paramList()
 			nointerface := p.bool()
 
-			mt := functypefield(recv[0], params, result)
-			addmethod(sym, mt, false, nointerface)
-
-			if dup {
-				// An earlier import already declared this type and its methods.
-				// Discard the duplicate method declaration.
-				p.funcList = append(p.funcList, nil)
-				continue
-			}
-
 			n := newfuncname(methodname(sym, recv[0].Type))
-			n.Type = mt
+			n.Type = functypefield(recv[0], params, result)
 			checkwidth(n.Type)
+			addmethod(sym, n.Type, false, nointerface)
 			p.funcList = append(p.funcList, n)
 			importlist = append(importlist, n)