When OPTIMIZE!=1, use the -hdevelop feature on CCE.

If this is not a --fast compilation or OPTIMIZE=1 is not set, use the cce
-hdevelop feature. It improves compiler time by throttling certain things in the
compiler that are known to add time. It is not the same as -O0. See the man
page for details.

### How much of a difference does -hdevelop make?

On a Cray system, using the quickstart configuration and
CHPL_LAUCHER=none, using `-hdevelop` is ~20% faster when
compiling `hello.chpl`. 

I did this with master and this branch to get the above results:

```bash
git checkout <branch>
source util/quickstart/setchplenv.bash
module load PrgEnv-cray
export CHPL_LAUNCHER=none
make -j
make check  # verify things work

# verify -hdevelop is present, or not
chpl --print-commands test/release/examples/hello.chpl
# -hdevelop should never be present with --fast
chpl --fast --print-commands test/release/examples/hello.chpl

# test it
for i in $(seq 1 5) ; do echo $i ; time chpl test/release/examples/hello.chpl ; done
```

With -hdevelop the real time for each of the compiles was 8.0 seconds (+/- some
hundredths). Without -hdevelop (i.e. on master) the real time for each of the compiles
was 9.8-10.3 seconds.

I did not test compile time for bigger codes or other configurations.