Ruby

Harden TestObjSpace#test_memsize_of_root_shared_string

This test occasionally fail because it runs into a String instance
that had its == method removed.

I couldn't identify where this String comes from, but in general
when using each_object it's best to not assume returned objectd
are functional.

By just inverting the operands of == we ensure it's always
String#== that is called.

 1) Error: TestObjSpace#test_memsize_of_root_shared_string: NoMethodError: undefined method '==' for #<String:0x00007f9b50e8c978> /tmp/ruby/src/trunk-random1/test/objspace/test_objspace.rb:35:in 'block in TestObjSpace#test_memsize_of_root_shared_string' /tmp/ruby/src/trunk-random1/test/objspace/test_objspace.rb:35:in 'ObjectSpace.each_object' /tmp/ruby/src/trunk-random1/test/objspace/test_objspace.rb:35:in 'TestObjSpace#test_memsize_of_root_shared_string'