SPMI: Segfault in JIT in superpmi-diffs

[jakobbotsch]

Latest superpmi-diffs runs are failing with segfaults:

[23:19:19] Invoking: /private/tmp/helix/working/ABD2093B/p/superpmi -a -v ewi -f /tmp/helix/working/ABD2093B/t/tmpehnwhr6j/coreclr_tests.run.linux.arm64.checked.mch_fail.mcl -details /tmp/helix/working/ABD2093B/t/tmpehnwhr6j/coreclr_tests.run.linux.arm64.checked.mch_details.csv -jitoption force JitEnableNoWayAssert=1 -jitoption force JitNoForceFallback=1 -jitoption force JitAlignLoops=0 -jit2option force JitEnableNoWayAssert=1 -jit2option force JitNoForceFallback=1 -jit2option force JitAlignLoops=0 -p -failureLimit 100 /tmp/helix/working/ABD2093B/p/base/checked/libclrjit_universal_arm64_arm64.dylib /tmp/helix/working/ABD2093B/p/diff/checked/libclrjit_universal_arm64_arm64.dylib /tmp/helix/working/ABD2093B/w/BF1A09FF/e/artifacts/spmi/mch/7a8cbc56-9e19-4321-80b9-a0d2c578c945.linux.arm64/coreclr_tests.run.linux.arm64.checked.mch
[23:22:56] ERROR: Child process 0 exited with code 139
[23:22:56] ERROR: Child process 1 exited with code 139
[23:22:56] ERROR: Child process 3 exited with code 139
[23:22:56] ERROR: Child process 4 exited with code 139
[23:22:56] ERROR: Child process 5 exited with code 139
[23:22:56] WARNING: Skipping merging CSV from child 0 due to result code -1
[23:22:56] WARNING: Skipping merging CSV from child 1 due to result code -1
[23:22:56] WARNING: Skipping merging CSV from child 3 due to result code -1
[23:22:56] WARNING: Skipping merging CSV from child 4 due to result code -1
[23:22:56] WARNING: Skipping merging CSV from child 5 due to result code -1
[23:22:56] Unknown error code 255, please check the log for more details.

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