[Bug 56401] New: Some ARM unwinding testcases broken by "ntdll: Use the correct structure for non-volatile registers"

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56401

Bug ID: 56401
           Summary: Some ARM unwinding testcases broken by "ntdll: Use the
                    correct structure for non-volatile registers"
           Product: Wine
           Version: 8.6
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 42cebcca3cf8220e5dfffecc99d51ded972c54d6
      Distribution: ---

The recent change 42cebcca3cf8220e5dfffecc99d51ded972c54d6, "ntdll: Use the
correct structure for non-volatile registers on ARM64.", broke two unwinding
testcases, seh0024 and seh0026 from
https://github.com/microsoft/compiler-tests/tree/master/seh. And likewise, the
corresponding change for ARM broke the exact same two testcases in ARM builds.

See https://martin.st/temp/arm-seh-testcases.zip for precompiled test binaries
to show the issue, e.g. arm64-seh-tests/compiler-test-seh/seh0024.exe and
arm64-seh-tests/compiler-test-seh/seh0026.exe within the zip.