C++ PATCH for c++/42387 (ICE on new of VLA)

[Jason Merrill]

Under the patch for PR28879, VLA types which had previously been 
considered dependent were no longer, and so some code that tried to do 
normal things with a non-dependent type would get confused.  Fixed by 
making VLAs type-dependent, just like an array with a value-dependent size.

Tested x86_64-pc-linux-gnu, applied to trunk and 4.4.
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