ilo: add functions for Gen8 relocs
ilo: add functions for Gen8 relocs

Extend ilo_builder_writer_reloc() for Gen8 memory addressing.  Add new
wrappers, ilo_builder_surface_reloc64(() and ilo_builder_batch_reloc64().

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler