Fix PR18381 - print a minimal diagnostic rather than assert on unresolved .secidx target

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200490 91177308-0d34-0410-b5e6-96231b3b80d8
[AArch64] Custom lower concat_vector patterns with v4i16, v4i32, v8i8, v8i16, v16i8 types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200491 91177308-0d34-0410-b5e6-96231b3b80d8
This file already has a "using namespace object;", use it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200493 91177308-0d34-0410-b5e6-96231b3b80d8