Backport manual fixes for GCC in order to fix various build and runtime errors.

Backport manual fixes for GCC in order to fix various build and runtime errors.

- Return to old hash table.
- Define missing void_zero_node macro.
- Add missing tree_int_cst_le function.
- Add missing gcc/signop.h header.
- Add missing macro.
- Add missing specialization stuff for double_int class.
- Add missing wi::clz and wi::clrsb functions. Add new file wide-int.cc.
- Remove include of double-int.h from gcc/gengtype.c and gcc/gengtype-state.c.
- Small fix for hash table. Change operator '->' to '.' because we have
  a reference to hash table, not a pointer.
- Change varpool_node::finalize_decl (var) back to varpool_finalize_decl (var).
- Fix sanopt.c optimizing part to fit old style pointer map.
- Fix for CHECK_TYPE_SIZE(__kernel_old_uid_t) and CHECK_TYPE_SIZE(__kernel_old_gid_t)
  fails on Aarch64.
- Replace gcall back to gimple_statement_call.
- Use old cgraph interface.
- Define missing void_node macro.
- Add missing SUBREG_PROMOTED_SIGN macro.
- Fix ICE in ubsan_type_descriptor due to overflow in tree_fits_uhwi_p.

Change-Id: I9741e28505c96c37fb1ff89f4721725c1a5a5eaf
Signed-off-by: Maxim Ostapenko <m.ostapenko@samsung.com>