CGVTables - silence static analyzer getAs<FunctionProtoType> null dereference warnings. NFCI.
CGVTables - silence static analyzer getAs<FunctionProtoType> null dereference warnings. NFCI.

The static analyzer is warning about potential null dereferences, but we should be able to use castAs<FunctionProtoType> directly and if not assert will fire for us.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@373398 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