C++ PATCH for c++/42567 (auto variable initialized from indirection)

[Jason Merrill]

I originally wrote describable_type to elide decltype where appropriate 
in mangling, but that turned out to be incompatible with the ODR; now 
it's only used for auto type deduction, so we don't need to handle the 
quirks of decltype semantics that the INDIRECT_REF case was failing to 
deal with properly.

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