type tester method into its own abstarct base class 'AbstractBase'.  And
added TestIntegerTypes.py and TestFloatTypes.py.

Added an option "-p reg-exp-pattern" to the test driver to specify a regular
expression pattern to match against eligible filenames as our test cases.

An example: 

/Volumes/data/lldb/svn/trunk/test $ ./dotest.py -v -p "TestFloat.*" types
----------------------------------------------------------------------
Collected 4 tests

test_double_type_with_dsym (TestFloatTypes.FloatTypesTestCase)
Test that double-type variables are displayed correctly. ... ok
test_double_type_with_dwarf (TestFloatTypes.FloatTypesTestCase)
Test that double-type variables are displayed correctly. ... ok
test_float_type_with_dwarf (TestFloatTypes.FloatTypesTestCase)
Test that float-type variables are displayed correctly. ... ok
test_float_types_with_dsym (TestFloatTypes.FloatTypesTestCase)
Test that float-type variables are displayed correctly. ... ok

----------------------------------------------------------------------
Ran 4 tests in 5.592s

OK

llvm-svn: 114923