C++ PATCH for c++/42447 (crash with array of incomplete type template parameter)

[Jason Merrill]

The hash function for template parameters was assuming that identical 
types will either all have TYPE_CANONICAL, or none.  But this is an 
invalid assumption for ARRAY_TYPE, as layout_type sets structural 
comparison for arrays of incomplete type.  So this patch adjusts the 
hash function to hash the element and domain directly.

Tested x86_64-pc-linux-gnu, applied to trunk.
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