[Sema] Check __builtin_bit_cast operand for completeness before materializing it.
[Sema] Check __builtin_bit_cast operand for completeness before materializing it.

This shouldn't be observable, but it doesn't make sense to materialize an
incomplete type.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@368610 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang