libgo patch committed: Upgrade to Go 1.9 release

[Ian Lance Taylor]

I've committed a patch to libgo to upgrade it to the recent Go 1.9 release.

As usual with these upgrades, the patch is too large to attach here.
I've attached the changes to files that are more or less specific to
gccgo.

This upgrade required some changes to the gotools Makefile.  And one
test had to be updated.  These patches are also below.

Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian

gotools/:
2017-09-14  Ian Lance Taylor  <iant@golang.org>

* Makefile.am (LIBGOTOOL): Define.
(go_cmd_go_files): Update for Go 1.9 release.
(go$(EXEEXT)): Depend on and link against $(LIBGOTOOL).
(CHECK_ENV): Add definition of shell variable fl.
(check-go-tool): Update for rearrangement of cmd/go sources in Go
1.9 release.  Echo failure message if test fails.
(check-runtime): Echo failure message if test fails.
(check-cgo-test, check-carchive-test): Likewise.
* Makefile.in: Rebuild.
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