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[libunwind] Increase the external value of _LIBUNWIND_CURSOR_SIZE for…
… SEH/x86_64 For x86_64 Windows targets (that use SEH), _LIBUNWIND_CURSOR_SIZE is 204; this fixes corruption in test cases that include libunwind.h without manually defining _LIBUNWIND_IS_NATIVE_ONLY. If the libunwind.h header is included without defining _LIBUNWIND_IS_NATIVE_ONLY (like in the libunwind test cases), the sizes are set to accommodate the maximum possible cursors and contexts. (Alternatively, __libunwind_config.h should be changed to default to native unwinding unless cross unwinding has been requested. Cross unwinding isn't implemented as far as I know anyway.) Differential Revision: https://reviews.llvm.org/D147634
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