string.c: STR_EMBEDABLE_P
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56151 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: STR_EMBEDABLE_P
if the given length is capable in an embedded string, and fix
possible integer overflow.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56151 b2dd03c8-39d4-4d8f-98ff-823fe69b080e