Refactoring: Introduce a new class LValue.

This CL is just moving code from AssignmentStatement to a new class. The goal
is to share code dealing with LValues.

LValues can be found here:
 -  lvalue = 2
 -  [for lvalue in exp]
 -  {a: b for lvalue in exp]
 -  for lvalue in exp: pass

The LValue itself can have different forms:
 -  a
 -  a, b
 -  a[0]
 -  a, (b, c)
 -  [a[0], (b, c)]
 -  a[1:5]

Although we may not handle everything, we need to make sure that the same
things can be used in variable assignment and in for loops.

--
MOS_MIGRATED_REVID=89015483
4 files changed
tree: 47555ca1a1d51b00d0e2234ad0f85ade2e50e452
  1. base_workspace/
  2. docs/
  3. scripts/
  4. src/
  5. third_party/
  6. tools/
  7. .gitignore
  8. .travis.yml
  9. bootstrap_test.sh
  10. compile.sh
  11. LICENSE.txt
  12. README.md
  13. WORKSPACE
README.md

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