(str2big_gmp): New function.
  (rb_cstr_to_inum): Use str2big_gmp for big bignums.
  (rb_str2big_gmp): New function.

* internal.h (rb_str2big_gmp): Declared.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42806 b2dd03c8-39d4-4d8f-98ff-823fe69b080e