Fix setting of StopIteration and GeneratorReturn.

Fix setting of StopIteration and GeneratorReturn.

- Set the global StopIteration correctly in the 'undefined' case.
- Use getters so that the effects of setStopIteration, etc, show up in
  traceur.runtime.StopIteration, etc. Previously it was only updated
  during runtime initialization.

BUG=None
TEST=test/feature/Yield/StopIteration.js

[usrbincc, 2013-03-13 20:26:38]

Patch order at a glance:

Add isStopIteration to '@iter' module. Update the tests to use it.
https://codereview.appspot.com/7610045/
Fix setting of StopIteration and GeneratorReturn.
https://codereview.appspot.com/7757044/

#--cut--
dl_check() {
  local f=$(basename $1)
  { test -e $f || curl -sO $1; } && openssl sha1 < $f | grep -q "= $2"
}

git checkout dbaacc7efc9fd56b   # recent HEAD for branch master

git checkout -b issue7757044-stopiteration-fix

### Add isStopIteration to '@iter' module. Update the tests to use it.
dl_check https://codereview.appspot.com/download/issue7610045_1.diff \
  d17eb1898e7a2a6c && git apply issue7610045_1.diff && make test
# Possibly useful, depending on your workflow.
#git commit -m issue7610045_1.diff

### force test-list remake since we're about to add a test.
rm test/test-list.js

### Fix setting of StopIteration and GeneratorReturn.
dl_check https://codereview.appspot.com/download/issue7757044_1.diff \
  7814257a9a566d43 && git apply issue7757044_1.diff && make test
#git commit -m issue7757044_1.diff
#--cut--

https://codereview.appspot.com/7757044/diff/1/src/runtime/runtime.js
File src/runtime/runtime.js (right):

https://codereview.appspot.com/7757044/diff/1/src/runtime/runtime.js#newcode403
src/runtime/runtime.js:403: global.StopIteration = StopIterationLocal;
Don't know what happened here. Must have gone too fast with the word
completion.

https://codereview.appspot.com/7757044/diff/1/test/feature/Yield/StopIteratio...
File test/feature/Yield/StopIteration.js (right):

https://codereview.appspot.com/7757044/diff/1/test/feature/Yield/StopIteratio...
test/feature/Yield/StopIteration.js:43:
traceur.runtime.setStopIteration(tmpStopIteration, tmp);
As you can see, this test is more about exercising the runtime code
than testing language features.

[usrbincc, 2013-03-30 16:33:33]

Note: I'm just cleaning out old issues. New patches will go through
github once I get up to speed on it.

----

Patch order at a glance:

Add isStopIteration to '@iter' module. Update the tests to use it.
https://codereview.appspot.com/7610045/
## you are here
Fix setting of StopIteration and GeneratorReturn.
https://codereview.appspot.com/7757044/

----

#--cut--
dl_check() {
  local f=$(basename $1)
  test -e $f || curl -sO $1
  openssl sha1 < $f | grep -q "= $2" && return 0
  echo sha1 mismatch! && return 1
}

git checkout 4b95bde73a18eb81   # last merge with branch master

git checkout -b issue7757044-stopiteration-fix

dl_check https://codereview.appspot.com/download/issue7610045_3001.diff \
  f6fe7fd74cd4e6a7 && git apply issue7610045_3001.diff && make test
#git commit -m issue7610045_3001.diff

## force test-list remake since we're about to add a test.
rm test/test-list.js

## you are here
dl_check https://codereview.appspot.com/download/issue7757044_10001.diff \
  56c03866b252d5c9 && git apply issue7757044_10001.diff && make test
#git commit -m issue7757044_10001.diff

## To undo all the above repo changes
#git reset --hard
#git checkout master
#git branch -D issue7757044-stopiteration-fix
#--cut--

[arv, 2013-04-02 18:05:13]

LGTM

Committed as 3758de5d46486130dd733f14fb6a01a65329ca24

https://codereview.appspot.com/7757044/diff/10001/test/feature/Yield/StopIter...
File test/feature/Yield/StopIteration.js (right):

https://codereview.appspot.com/7757044/diff/10001/test/feature/Yield/StopIter...
test/feature/Yield/StopIteration.js:1: import isStopIteration from '@iter';
import {isStopIteration} from '@iter';

I wen't through all of these once before in preparation for modules v2.