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[binutils-gdb] bfd: alpha: Fix crash caused by double free with --no-keep-memory

*** TEST RESULTS FOR COMMIT ae4fda663812129df67e3a70691787060242c0f9 ***

Author: James Clarke <jrtc27@jrtc27.com>
Branch: master
Commit: ae4fda663812129df67e3a70691787060242c0f9

bfd: alpha: Fix crash caused by double free with --no-keep-memory

Without this, ld has been seen to crash in libc when freeing tsec_free:

*** Error in `/usr/bin/ld': double free or corruption (!prev): 0x0000000120ceb6a0 ***

_bfd_elf_link_read_relocs will always return the cached value if
present, even if keep_memory is false, therefore setting tsec_free to
NULL only when keep_memory is true is not sufficient.

	* elf64-alpha.c (elf64_alpha_relax_opt_call): Don't set tsec_free
	if relocs are cached.
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