Adding SSA test cases, and some installation simplifications.

[jtpaasch]

• Adding three different simple test cases that exercise different kinds of bugs related to the SSA problem. These test cases live at resources/exes/arm-simple-ssa-{1,2,3}. You can exercise them individually from the root of the REPO:
  • bash bin/system-tests/run-test.bash test_arm_simple_ssa_1
  • bash bin/system-tests/run-test.bash test_arm_simple_ssa_2
  • bash bin/system-tests/run-test.bash test_arm_simple_ssa_3
• I also added a few conveniences in the bin/setup folder for ubuntu installation, which simplifies the README a bit.

[jtpaasch]

As always @ccasin, thanks for all the great finds on this one. I've now got only one regular SSA case and one Linear SSA case. Neither are listed in the run_all test target yet, because they don't pass, but we'll move them in when it's time.

Shall I merge?

[ccasin]

Looks great - thanks. Merge away.