[llvm-objcopy] Add support for large indexes
Because of -ffunction-sections (and maybe other use cases I'm not aware of?) it
can occur that we need more than 0xfeff sections but ELF dosn't support that
many sections. To solve this problem SHN_XINDEX exists and with it come a whole
host of changes for section indexes everywhere. This change adds support for
those cases which should allow llvm-objcopy to copy binaries that have an
arbitrary number of sections.
Differential Revision: https://reviews.llvm.org/D42516
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@326940
91177308-0d34-0410-b5e6-
96231b3b80d8
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