MdePkg/BasePeCoffLib: skip runtime relocation if reloc info is invalid

MdePkg/BasePeCoffLib: skip runtime relocation if reloc info is invalid

Skip runtime relocation for PE images that provide invalid relocation
infomation (ex: RelocDir->Size = 0) to fix a hang observed while booting
Windows.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Neo Hsueh <hong-chihx.hsueh@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Bi Dandan <dandan.bi@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>