cmd/go: quote command line arguments in debug output

Debug output from go test -x may contain empty arguments.
This CL quotes arguments if needed. E.g. the output of
go test -x is now
  .../6g -o ./_go_.6 -p testmain -complete -D "" -I . -I $WORK ./_testmain.go
which is easier to grasp.

R=golang-dev, bradfitz, minux.ma, r
CC=golang-dev
https://codereview.appspot.com/8633043

Committer: Rob Pike <r@golang.org>
cmd/go: quote command line arguments in debug output

Debug output from go test -x may contain empty arguments.
This CL quotes arguments if needed. E.g. the output of
go test -x is now
  .../6g -o ./_go_.6 -p testmain -complete -D "" -I . -I $WORK ./_testmain.go
which is easier to grasp.

R=golang-dev, bradfitz, minux.ma, r
CC=golang-dev
https://codereview.appspot.com/8633043

Committer: Rob Pike <r@golang.org>
test: raise the allocation threshold for chan/select2.go failure

Updates issue 5282

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/8718045
test: make goprint.go wait longer for go its routine to execute

Update issue 5281

R=golang-dev, r, bradfitz, cshapiro
CC=golang-dev
https://codereview.appspot.com/8631047
testing/iotest: rephrase DataErrReader's description

R=r
CC=golang-dev
https://codereview.appspot.com/8650044

Committer: Rob Pike <r@golang.org>
go/scanner: reject BOMs that are not at the beginning

For compliance with gc. See also issue 5265.
Not Go1.1 critical, but harmless.

R=r
CC=golang-dev
https://codereview.appspot.com/8736043
cmd/gc: disable inlining of method values

They caused internal compiler errors and they're expensive enough that inlining them doesn't make sense.

Fixes issue 5259.

R=golang-dev, r, iant, remyoudompheng
CC=golang-dev
https://codereview.appspot.com/8636043