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When -fsanitize=hwaddress is used, libhwasan will try to enable LAM_U57 in the startup code. Update the target check to enable hwaddress tests if LAM_U57 is enabled. Also compile hwaddress tests with -mlam=u57 on x86-64 since hwasan requires LAM_U57 on x86-64. * lib/hwasan-dg.exp (check_effective_target_hwaddress_exec): Return 1 if Intel LAM_U57 is enabled. (hwasan_init): Add -mlam=u57 on x86-64.
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