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[PATCH] PR libstdc++/82262 fix std::hash<std::optional<const T>>


The std::hash specialization for std::optional was missing a
remove_const_t so tried to use a disabled hash specialization.

	PR libstdc++/82262
	* include/std/optional (__optional_hash_call_base): Add template
	parameter for remove_const_t<_Tp> and use it consistently.
	* testsuite/20_util/optional/hash.cc: Test optional<const T>.

Tested powerpc64le-linux, committing to trunk and gcc-7-branch.

Attachment: patch.txt
Description: Text document


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