Linux test case cleanup:
- Enable TestFormatters.py: expressions with "new" work
- Enable TestChangeValueAPI.py: llvm.org/PR15039 fixed
- Disable expression_command/call-restarts due to llvm.org/PR15278
- Disable expression_command/call-throws due to ObjC test program



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175287 91177308-0d34-0410-b5e6-96231b3b80d8