Ruby » Ruby master

merge revision(s) 49096,51353,53168,53169: [Backport #11834]

    test_m17n.rb: split test_scrub

    * test/ruby/test_m17n.rb (TestM17N#test_scrub): split into some

tests.
* include/ruby/ruby.h: add raw FL macros, which assume always the
argument object is not a special constant.

    * internal.h (STR_EMBED_P, STR_SHARED_P): valid only for T_STRING.

    * string.c: deal with taint flags directly across String instances.

    * transcode.c (rb_econv_substr_append, econv_primitive_convert):
      the result should be infected by the original string.

    * string.c (rb_str_scrub): the result should be infected by the
      original string.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@53825 b2dd03c8-39d4-4d8f-98ff-823fe69b080e