That's a bad idea.
You shouldn't change the permissions on files in /usr directories except for the ones that you (the system administrator) own like in /usr/local.
Furthermore, running a command like chmod -R is especially dangerous, if you do not understand what you are doing.
The *.pm files in /usr are supposed to have 0644 permissions. They should not be set with execute. They are not executable files, after all.
Having said all that, this particular change is most likely benign. But you should never change files in the /usr directory except your own. These files and their permissions are managed by the system and rpm(8) in the OP's case.
Run the command rpm -V perl to see all the "damage" now.
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