Added an SBAPI to get the PythonPath (if the Host knows how to do that). And a -P option to the Driver

to print it out.  Changed dotest.py to use that to find the PythonPath it should use given the lldb binary
it was told to run.

llvm-svn: 170932

lldb/source/API/SBHostOS.cpp

@@ -26,6 +26,18 @@ SBHostOS::GetProgramFileSpec ()
     return sb_filespec;
 }
 
+SBFileSpec
+SBHostOS::GetLLDBPythonPath ()
+{
+    SBFileSpec sb_lldb_python_filespec;
+    FileSpec lldb_python_spec;
+    if (Host::GetLLDBPath (ePathTypePythonDir, lldb_python_spec))
+    {
+        sb_lldb_python_filespec.SetFileSpec (lldb_python_spec);
+    }
+    return sb_lldb_python_filespec;
+}
+
 lldb::thread_t
 SBHostOS::ThreadCreate
 (