CGExprAgg - remove duplicate code. NFCI.
CGExprAgg - remove duplicate code. NFCI.

Remove duplicate getAs<> call, avoiding a clang static analyzer null dereference warning.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@373396 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