Fix nacl-gdb so that it can read ELF core dump files

gdb/nacl-tdep.c

Index: gdb/nacl-tdep.c
diff --git a/gdb/nacl-tdep.c b/gdb/nacl-tdep.c
index da118e471eed20618ce9abfbd06d1045f91ffc68..0032c20cfaf8820096c69fbac3302f2081cb0100 100644
--- a/gdb/nacl-tdep.c
+++ b/gdb/nacl-tdep.c
@@ -69,6 +69,7 @@ i386_nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   linux_init_abi (info, gdbarch);
   i386_elf_init_abi (info, gdbarch);
+  i386_linux_init_gregset (tdep);
   tdep->tdesc = tdesc_i386_linux;
   set_solib_svr4_fetch_link_map_offsets (gdbarch,
 					 svr4_ilp32_fetch_link_map_offsets);
@@ -190,6 +191,7 @@ amd64_nacl_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   linux_init_abi (info, gdbarch);
   amd64_init_abi (info, gdbarch);
+  amd64_linux_init_gregset (tdep);
   tdep->tdesc = tdesc_amd64_linux;
   set_solib_svr4_fetch_link_map_offsets (gdbarch,
 					 amd64_nacl_fetch_link_map_offsets);