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iseq.c (iseq_data_to_ary): dump kw_arg as symbol

Fix RubyVM::InstructionSequence#to_a after r49517
Keywords were made symbols to fix [Bug #10831] [ruby-core:68031],
so we should dump symbols as-is instead of attempting to convert
them from IDs

• iseq.c (iseq_data_to_ary): dump kw_arg as symbol
• test/-ext-/iseq_load/test_iseq_load.rb: test kw_arg roundtrip
  [ruby-core:69891] [Bug #11338]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e