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[libunwind][DWARF] Fix end of .eh_frame calculation
* When .eh_frame is located using .eh_frame_hdr (PT_GNU_EH_FRAME), the start of .eh_frame is known, but not the size. In this case, the unwinder must rely on a terminator present at the end of .eh_frame. Set dwarf_section_length to UINTPTR_MAX to indicate this. * Add a new field, text_segment_length, that the FrameHeaderCache uses to track the size of the PT_LOAD segment indicated by dso_base. * Compute ehSectionEnd by adding sectionLength to ehSectionStart, never to fdeHint. Fixes PR46829. Differential Revision: https://reviews.llvm.org/D87750
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