LoongArch: Move ifunc info to rela.dyn from rela.plt.

  Delete R_LARCH_IRELATIVE from dynamic loader (glibc ld.so) when
  loading lazy function (rela.plt section).

  In dynamic programes, move ifunc dynamic relocate info to section
  srelgot from srelplt.

  bfd/
    elfnn-loongarch.c