x86-64: Always check IBT PLT before BND PLT

Since BND PLT has been deprecated and the same IBT PLT is used for both
x86-64 and x32, always check IBT PLT before BND PLT when synthesizing
PLT symtab.

	* elf64-x86-64.c (elf_x86_64_get_synthetic_symtab): Always check
	elf_x86_64_lazy_ibt_plt and elf_x86_64_non_lazy_ibt_plt first.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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