cmd/link: remove windows-specific kludges from Adddynrel

Adddynrel does nothing on windows. We can make code don't call Adddynrel
on windows in the first place.

Change-Id: I376cc36d44a5df18bda13be57e3916ca3062f181
Reviewed-on: https://go-review.googlesource.com/62611
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

src/cmd/link/internal/amd64/asm.go

@@ -239,16 +239,11 @@ func adddynrel(ctxt *ld.Link, s *ld.Symbol, r *ld.Reloc) bool {
 			// nothing to do, the relocation will be laid out in reloc
 			return true
 		}
-		if ld.Headtype == objabi.Hwindows {
-			// nothing to do, the relocation will be laid out in pereloc1
-			return true
-		} else {
 		// for both ELF and Mach-O
 		addpltsym(ctxt, targ)
 		r.Sym = ctxt.Syms.Lookup(".plt", 0)
 		r.Add = int64(targ.Plt)
 		return true
-		}
 
 	case objabi.R_ADDR:
 		if s.Type == ld.STEXT && ld.Iself {
@@ -359,11 +354,6 @@ func adddynrel(ctxt *ld.Link, s *ld.Symbol, r *ld.Reloc) bool {
 			r.Type = 256 // ignore during relocsym
 			return true
 		}
-
-		if ld.Headtype == objabi.Hwindows {
-			// nothing to do, the relocation will be laid out in pereloc1
-			return true
-		}
 	}
 
 	return false

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

@@ -803,8 +803,10 @@ func windynrelocsym(ctxt *Link, s *Symbol) {
 }
 
 func dynrelocsym(ctxt *Link, s *Symbol) {
-	if Headtype == objabi.Hwindows && Linkmode != LinkExternal {
+	if Headtype == objabi.Hwindows {
+		if Linkmode == LinkInternal {
 			windynrelocsym(ctxt, s)
+		}
 		return
 	}
 

src/cmd/link/internal/x86/asm.go

@@ -335,11 +335,6 @@ func adddynrel(ctxt *ld.Link, s *ld.Symbol, r *ld.Reloc) bool {
 			r.Type = 256 // ignore during relocsym
 			return true
 		}
-
-		if ld.Headtype == objabi.Hwindows && s.Size == int64(ld.SysArch.PtrSize) {
-			// nothing to do, the relocation will be laid out in pereloc1
-			return true
-		}
 	}
 
 	return false