Host: 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 silences a warning emitted by GCC when building LLDB.

[majnemer]

Closed by commit rL213693 (authored by @majnemer).

lldb/trunk/source/Host/common/Host.cpp

Host::GetLLDBPath (PathType path_type, FileSpec &file_spec)
 
     switch (path_type)
     {
     case ePathTypeLLDBShlibDir:
         {
             static ConstString g_lldb_so_dir;
             if (!g_lldb_so_dir)
             {
-                FileSpec lldb_file_spec (Host::GetModuleFileSpecForHostAddress ((void *)Host::GetLLDBPath));
+                FileSpec lldb_file_spec(Host::GetModuleFileSpecForHostAddress(
+                    reinterpret_cast<void *>(reinterpret_cast<intptr_t>(Host::GetLLDBPath))));
                 g_lldb_so_dir = lldb_file_spec.GetDirectory();
                 if (log)
                     log->Printf("Host::GetLLDBPath(ePathTypeLLDBShlibDir) => '%s'", g_lldb_so_dir.GetCString());
             }
             file_spec.GetDirectory() = g_lldb_so_dir;
             return (bool)file_spec.GetDirectory();
         }
         break;