libgo patch committed: Re-enable a couple of tests

[Ian Lance Taylor]

This libgo patch re-enables a couple of tests that are specific gccgo.
This is a port of https://golang.org/cl/120375 so that it gets more
reliable testing.  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 261819)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-c3ef5bbf4e4271216b6f22621269d458599e8087
+d3eb93c1b8990dbfd4bb660c5c8454916b62655c
 
 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/go_test.go
===================================================================
--- libgo/go/cmd/go/go_test.go  (revision 261819)
+++ libgo/go/cmd/go/go_test.go  (working copy)
@@ -791,7 +791,6 @@ func TestBuildComplex(t *testing.T) {
        tg.run("build", "-x", "-o", os.DevNull, "complex")
 
        if _, err := exec.LookPath("gccgo"); err == nil {
-               t.Skip("golang.org/issue/22472")
                tg.run("build", "-x", "-o", os.DevNull, "-compiler=gccgo", 
"complex")
        }
 }
@@ -2944,7 +2943,6 @@ func TestIssue7573(t *testing.T) {
        if _, err := exec.LookPath("gccgo"); err != nil {
                t.Skip("skipping because no gccgo compiler found")
        }
-       t.Skip("golang.org/issue/22472")
 
        tg := testgo(t)
        defer tg.cleanup()