[libunwind] [SEH] Implement parsing of aarch64 pdata/xdata (#137949) This is needed for forced unwind, for some testcases in libunwind/libcxxabi. This adds an aarch64 case for extracting the LanguageHandler and HandlerData fields from unwind info, in UnwindCursor::getInfoFromSEH, corresponding to the existing case for x86_64. This uses the struct IMAGE_ARM64_RUNTIME_FUNCTION_ENTRY_XDATA; this only became available in WinSDK 10.0.19041.0 and mingw-w64 v11.0 (or a mingw-w64 git snapshot after April 2023). (This is only a build-time requirement though; the format for the unwind data has been fixed since the start of Windows 10 on ARM64, so this doesn't impose any runtime requirement.)
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