[mips] XFAIL dfsan's custom.cc test on mips64.
Test was already marked as failing for mips64el. Now that it's being
tested on mips64, it has to be XFAILed there as well.
// RUN: %clang_dfsan -DSTRICT_DATA_DEPENDENCIES %s -o %t && %run %t
// RUN: %clang_dfsan -DSTRICT_DATA_DEPENDENCIES -mllvm -dfsan-args-abi %s -o %t && %run %t
-// XFAIL: target-is-mips64el
+// XFAIL: target-is-mips64,target-is-mips64el
// Tests custom implementations of various glibc functions.
