PENCIL tools version 1.1.

ChangeLog:
* use half instead of half float.
* Update PENCIL testsuite.
* Remove outdated vobla testsuite.
* Ensure type correctness in GCP.
* Reset dead code elimination pass before executing.
* Add --version option
* Allow single test case execution
* Support multi-file linker tests in testsuite.
* Support FileCheck tool in configure.
* Introduce debug option to dump PENCIL parse tree.
* Execute optimization passes until fixed point
* Deprecate SplitFile pass.
* Rework Pass Manager.
* Introduce SCoPs in pencil.
* Allow boolean expressions to be compared (eq, neq only).
* Check for function compatibility in linker.
* Don't move invariants from loop bounds.
* Remove unused static functions.
* Move invariants from all possible expressions.
* Compute reaching definitions for struct lvalues.
* add pointer support
* Support sizeof expressions.

Change-Id: I0982048353e538603079b25f1ccf8ec64770e7a2