Explicitly select IAS in new embed-bitcode.c test.
Explicitly select IAS in new embed-bitcode.c test.

This should fix clang-cmake-mips builder since MIPS does not have IAS enabled
by default (yet).



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@262350 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang