Add test for a construct we currently reject, constant-evaluating a load from a constant string.  Given that gcc doesn't accept this, we should continue to not accept it, even though it was accidentally supported by clang for a brief period.
Add test for a construct we currently reject, constant-evaluating a load from a constant string.  Given that gcc doesn't accept this, we should continue to not accept it, even though it was accidentally supported by clang for a brief period.



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@154564 91177308-0d34-0410-b5e6-96231b3b80d8

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