#if defined(VGA_arm) || defined(VGA_arm64)
VG_(printf)("SGCheck doesn't work on ARM yet, sorry.\n");
VG_(exit)(1);
#endif
But exp-sgcheck/tests/is_arch_supported checked against uname -m
which returns aarch64 (not arm64). Fix the test check so the
exp-sgcheck tests are skipped instead of producing failures.