G++ OpenMP implementation uses TREE_COMPLEXITY?!?!

[Paolo Bonzini]

> I rather create a new tree for template usage really, so you don't create
> an extra tree and save a little amount of memory.

This, however, would consume another scarce resource, i.e. tree codes. 
The attached patch, in the meanwhile, has been bootstrapped and 
regtested i686-pc-linux-gnu, C/C++ only, with no regression.  Note that 
this is *not* the patch I sent yesterday, which did not work.

Ok for mainline?

Paolo
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