Simplify the the generic AbstractBase.py test base for testing variable types.

We still have the the issue where running:

    ./dotest.py -v types

we have test failures where the inferior either runs to exited with status 0 or
the inferior stops but not because of breakpoint (for example):

runCmd: process status
output: Process 90060 stopped
* thread #1: tid = 0x2d03, 0x000000010000e2ca, stop reason = EXC_BAD_ACCESS (code=2, address=0x10000e2ca)
  frame #0: 0x000000010000e2ca

There are two cases where the inferior stops for the breakpoint (good), but the expression parser
prints out the wrong information.  The two failures are:

Failure-TestFloatTypesExpr.FloatTypesExprTestCase.test_double_type_with_dsym.log
Failure-TestFloatTypesExpr.FloatTypesExprTestCase.test_double_type_with_dwarf.log

I'll file a radar on the two expression parser misbehave, while continue investigating why the
inferior stops for the wrong reason or does not stop at all.

For now, you'll need to do:

    ./dotest.py -v -w types

llvm-svn: 133488