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[binutils-gdb] Fix powerpc64 segfault caused by zero r_symndx relocs.

*** TEST RESULTS FOR COMMIT c27b8c2aeb369972f4f9f98f390607694c56a127 ***

Author: Alan Modra <amodra@gmail.com>
Branch: master
Commit: c27b8c2aeb369972f4f9f98f390607694c56a127

Fix powerpc64 segfault caused by zero r_symndx relocs.

Fixes a segfault in ppc64_elf_tls_optimize found when testing
R_PPC64_ENTRY, and potential for trouble in other places found by
code inspection.

	* elf64-ppc.c (ppc64_elf_tls_optimize): Don't segfault on NULL
	symbol section or output section.
	(ppc64_elf_edit_toc): Similarly for ld -R objects.
	(ppc64_elf_size_stubs): Likewise.
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