Add icc support to the test suite
-adds icc to the lit of compilers to run the tests
-adds icc test decorators
-skip TestAnonymous.py for icc

Patch by Ashok Thirumurthi.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177174 91177308-0d34-0410-b5e6-96231b3b80d8