* LLVM reactor backend: requires LLVM 7.0
* Subzero reactor backend: not supported

Bug: b/117854176
Change-Id: I7b76ebf854f65c2d111552552bd5a81c049d3b50
Reviewed-on: https://swiftshader-review.googlesource.com/c/22308Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Gordana Cmiljanovic <gordana.cmiljanovic@mips.com>