arm: enable 8 more packages
The remaining failures include:
* something about bit operations?
crypto/block
encoding/binary
* something about file I/O?
archive/tar
archive/zip
debug/dwarf
debug/elf
debug/macho
image/png
* floating point
cmath
expvar
flag
fmt
gob
json
math
strconv
template
xml
* network (maybe fixed by a pending CL)
http
netchan
rpc
rpc/jsonrpc
syslog
websocket
* line numbers
log
* haven't bothered / not sure
exp/datafmt
exp/eval
go/printer
os
os/signal
testing/quick
R=ken2
CC=golang-dev
https://golang.org/cl/
2496041