Add a '-b blacklistFile' option to the test driver to take a file specifying the

test classes or test cases to be excludued from the test suite.

Check in an example blacklist file: blacklist.py:

"""
'blacklist' is a Python dictionary, it stores the mapping of a string describing
either a testclass or a testcase, i.e, testclass.testmethod, to the reason (a
string) it is blacklisted.

Following is an example which states that test class IntegerTypesExprTestCase
should be skipped because 'This test class crashed' and the test case
FoundationTestCase.test_data_type_and_expr_with_dsym should be skipped because
it is 'Temporarily disabled'.

blacklist = {'IntegerTypesExprTestCase': 'This test class crashed',
             'FoundationTestCase.test_data_type_and_expr_with_dsym': 'Temporarily disabled'
             }
"""

blacklist = {}

An example of invoking the test driver and specifying a blacklist file:

./dotest.py -b blacklist.py -v types

This runs the tests under 'types' directory but excludes the tests specified in
balcklist.py.

llvm-svn: 120620