x86: Check plt_got_offset for lazy IBT PLT

x86: Check plt_got_offset for lazy IBT PLT

Lazy IBT PLT entries look like

static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
{
  0xf3, 0x0f, 0x1e, 0xfb,       /* endbr32                    */
  0x68, 0, 0, 0, 0,             /* pushl immediate            */
  0xe9, 0, 0, 0, 0,             /* jmp relative               */
  0x66, 0x90                    /* xchg %ax,%ax               */
};

static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
{
  0xf3, 0x0f, 0x1e, 0xfa,       /* endbr64                    */
  0x68, 0, 0, 0, 0,             /* pushq immediate            */
  0xe9, 0, 0, 0, 0,             /* jmpq relative              */
  0x66, 0x90                    /* xchg %ax,%ax               */
};

They only have

unsigned int plt_reloc_offset;  /* ... offset into relocation table. */

and don't have

unsigned int plt_got_offset;    /* ... address of this symbol in .got. */

We should use plt_reloc_offset, not plt_got_offset, to check IBT PLT.

	PR binutils/33358
	* elf32-i386.c (elf_i386_get_synthetic_symtab): Check
	plt_reloc_offset for lazy IBT PLT.
	* elf64-x86-64.c (elf_x86_64_get_synthetic_symtab): Likewise.

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