Richard Smith b01fe40c07 Reject a slightly-sneaky way to perform a read of mutable state from within a ...

constexpr function. Part of this fix is a tentative fix for an as-yet-unfiled
core issue (we're missing a prohibition against reading mutable members from
unions via a trivial constructor/assignment, since that doesn't perform an
lvalue-to-rvalue conversion on the members).

llvm-svn: 217852

2014-09-16 01:24:02 +00:00

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