Core: preprocess out TestPromptFormats

TestPromptFormats appears as though it may be a useful unit test.
Unfortunately, there is no invocation mechanism in place right now.  It is
unclear how to add a unit test for this scenario to the existing tests.  It
would be ideal to remove this entirely, but I am hopeful that this can/will be
pulled out into a test still since it uses a user accessible interface.

llvm-svn: 204309
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 51a4aaa..e596fc2 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -1089,6 +1089,7 @@
     return debugger_sp;
 }
 
+#if 0
 static void
 TestPromptFormats (StackFrame *frame)
 {
@@ -1149,6 +1150,7 @@
         printf ("what we got: %s\n", s.GetData());
     }
 }
+#endif
 
 static bool
 ScanFormatDescriptor (const char* var_name_begin,