SBHostOS: Fix a pointer-to-function to void-pointer cast

[majnemer]

Summary

reinterpret_cast may not convert a pointer-to-function to a
void-pointer. Take a detour through intptr_t and *then* convert to a
pointer-to-function.

This fixes a warning emitted by GCC.

[majnemer]

Closed by commit rL213692 (authored by @majnemer).

lldb/trunk/source/API/SBHostOS.cpp

(
     void *thread_arg,
     SBError *error_ptr
 )
 {
     Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
 
     if (log)
         log->Printf ("SBHostOS::ThreadCreate (name=\"%s\", thread_function=%p, thread_arg=%p, error_ptr=%p)",
-                     name, reinterpret_cast<void*>(thread_function),
+                     name, reinterpret_cast<void*>(reinterpret_cast<intptr_t>(thread_function)),
                      static_cast<void*>(thread_arg),
                      static_cast<void*>(error_ptr));
 
     // FIXME: You should log the return value?
 
     return Host::ThreadCreate (name, thread_function, thread_arg, error_ptr ? error_ptr->get() : NULL);
 }