The LLVM JIT fails loudly when attempting to parse this command line
option when targeting non-x86 CPUs.

Bug: b/157555596
Change-Id: Ic5ddccbdbc86c2f03ded5f4004369ece0100c031
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/52488
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>