Ignore reduce-fadd-unordered on SGX platform

tests/assembly/simd/reduce-fadd-unordered.rs

@@ -4,6 +4,7 @@
 //@[aarch64] only-aarch64
 //@[x86_64] only-x86_64
 //@[x86_64] compile-flags: -Ctarget-feature=+sse3
+//@ ignore-sgx Test incompatible with LVI mitigations
 #![feature(portable_simd)]
 #![feature(core_intrinsics)]
 use std::intrinsics::simd as intrinsics;