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insns.def (opt_case_dispatch): check Float#=== redefinition

The missing check for Float#=== redefinition was noticed while
working on enhancing optimized case dispatch for nil/true/false
in [ruby-core:71818] https://bugs.ruby-lang.org/issues/11769

So no, I don't normally redefine core classes like this :P

• insns.def (opt_case_dispatch): check Float#=== redefinition
• test/ruby/test_optimization.rb (test_opt_case_dispatch): new
  [ruby-core:71920] [Bug #11784]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52928 b2dd03c8-39d4-4d8f-98ff-823fe69b080e