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
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]