Remove hardcoded -arch from lang/cpp testcase makefiles
- skip rdar12991846 (already marked expected-fail) to avoid introducing a i386 crash



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@173483 91177308-0d34-0410-b5e6-96231b3b80d8
Disable confirmation prompts for testing
- set auto-confirm to false when running TestExprs (avoid hang when using API)
- set prompt-on-quit to false in test helper (avoid timeout when using lldb CLI)



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@173485 91177308-0d34-0410-b5e6-96231b3b80d8