Add slow tags

Author: andrykonchin

spec/tags/core/kernel/system_tags.txt

@@ -20,3 +20,5 @@ slow:Kernel#system raises RuntimeError when `exception: true` is given and the c
 slow:Kernel#system raises Errno::ENOENT when `exception: true` is given and the specified command does not exist
 slow:Kernel.system raises RuntimeError when `exception: true` is given and the command exits with a non-zero exit status
 slow:Kernel.system raises Errno::ENOENT when `exception: true` is given and the specified command does not exist
+slow:Kernel#system executes with `sh` if the command is executable but not binary and there is no shebang
+slow:Kernel.system executes with `sh` if the command is executable but not binary and there is no shebang

spec/tags/language/string_tags.txt

@@ -3,3 +3,4 @@ slow:Ruby String literals with a magic frozen comment produce the same object fo
 slow:Ruby String literals with a magic frozen comment produce the same object for literals with the same content in different files
 slow:Ruby String literals with a magic frozen comment produce different objects for literals with the same content in different files if the other file doesn't have the comment
 slow:Ruby String literals with a magic frozen comment produce different objects for literals with the same content in different files if they have different encodings
+slow:Ruby String literals with a magic frozen comment produces different objects for literals with the same content in different files if the other file doesn't have the comment and String literals aren't frozen by default