8043722: Swapped usage of idx_t and bm_word_t types in parMarkBitMap.cpp Summary: Clean up usage of idx_t and uintptr_t when using it in conjunction with BitMap::set_map(), casting to the appropriate type. Fixes compilation on S390. Reviewed-by: tschatzl Contributed-by: Dan Horak <dhorak@redhat.com>

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