string.c: SHARABLE_SUBSTRING_P
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45633 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: SHARABLE_SUBSTRING_P
shared with the original string. true if just at the end of the
original string, for the time being. all substring will be able to
be shared in the future.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45633 b2dd03c8-39d4-4d8f-98ff-823fe69b080e