This enables LLVM reactor backend to be used for mipsel
in Chromium, though Subzero remains the default option.

Bug: b/117854176
Change-Id: I8c66017cd3a966202b61f8cbd65e065e3512e1e5
Reviewed-on: https://swiftshader-review.googlesource.com/c/22008Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Gordana Cmiljanovic <gordana.cmiljanovic@mips.com>