[ia64] Workaround an ICE when built with gcc-13

As per 1 and 2 an ICE happens for target ia64 when compiled with gcc-13. Also per 2 -fno-var-tracking works around that problem and will re-enable successful builds for ia64 until 2 is fixed. This MR adds -fno-var-tracking for the compilation of the two files identified by 1 that trigger the problem. In addition -fno-var-tracking is only used when the target architecture is ia64, so this change does not affect any other architectures.