offload data version number

[Nathan Sidwell]

This trunk patch implements new register and unregister entry points to allow 
specifying data version information.  (I'll shortly be posting patches changing 
the PTX offload data format.)

We now have GOMP_offload_{,un}register_2, which take an additional unsigned int 
version number.  The version number is composed of two parts.  16 bits for the 
libgomp version and 16 bits for the device-specific plugin.  Currently both are 
zero.  When the PTX data changes, that device-specific value will increment.

The existing register/unregister calls forward to the new ones, providing zero 
for the version information.

On the plugin side I've added 2 new entry points GOMP_OFFLOAD_{,un}load_image_2, 
which also take an additional version number argument.  These entry points are 
optional, and only added to the PTX plugin.  The existing plugin entrypoints 
forward to the new ones.

libgomp  will use these new entry points if they exist, otherwise use the 
original entry points, provided the incoming version is zero.

I added the GOMP_offload_{,un}register_2 routines to the libgomp map file as 
version 4.0.2 -- I wasn't sure whether to increment it more than that. Advice 
sought.

ok?

nathan
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