adding buggy SSA join test
Cleanup and adding proper type to createElt.ts
First working version of ssajoin for globals.

  - Need to run regression
Fixes in loop phis.
Merge branch 'master' into ssajoin
Fixes in SSA - using separate env for updated glob

  - Ambient vars are initialized.

  - Fixes in tests.
Adding some untracked tests.
adding fb tests to regrtest
all tests pass including FB
Merge pull request #66 from UCSD-PL/ssajoin

Global variable initialization