In the update of libgo to Go1.12beta2 I accidentally lost the code
that passes D to the ar program.  This patch restores it.
Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian
Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 269315)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-805c82cc141c593ea2f27d8614ecd204e2b5e76e
+a72eca1f435002076655fd6a54ce869ac39856dc
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/go/cmd/go/internal/work/gccgo.go
===================================================================
--- libgo/go/cmd/go/internal/work/gccgo.go      (revision 269299)
+++ libgo/go/cmd/go/internal/work/gccgo.go      (working copy)
@@ -205,11 +205,14 @@ func (tools gccgoToolchain) pack(b *Buil
        if cfg.Goos == "aix" && cfg.Goarch == "ppc64" {
                // AIX puts both 32-bit and 64-bit objects in the same archive.
                // Tell the AIX "ar" command to only care about 64-bit objects.
-               // AIX "ar" command does not know D option.
                arArgs = []string{"-X64"}
        }
-
-       return b.run(a, p.Dir, p.ImportPath, nil, tools.ar(), arArgs, "rc", 
mkAbs(objdir, afile), absOfiles)
+       absAfile := mkAbs(objdir, afile)
+       // Try with D modifier first, then without if that fails.
+       if b.run(a, p.Dir, p.ImportPath, nil, tools.ar(), arArgs, "rcD", 
absAfile, absOfiles) != nil {
+               return b.run(a, p.Dir, p.ImportPath, nil, tools.ar(), arArgs, 
"rc", absAfile, absOfiles)
+       }
+       return nil
 }
 
 func (tools gccgoToolchain) link(b *Builder, root *Action, out, importcfg 
string, allactions []*Action, buildmode, desc string) error {

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