When a static storage duration temporary appears in a constant expression, it
must be initialized by a constant expression (not just a core constant
expression), because we're going to emit it as a global. Core issue for this is
pending.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183388 91177308-0d34-0410-b5e6-96231b3b80d8