Merge changes from topic "merge_genrule"
* changes:
gn2bp: Merge cc_genrule cmd
gn2bp: Remove arch suffix from the genrule
gn2bp: Support merging genrule
gn2bp: Add function to merge modules
gn2bp: Add function to merge cmd for genrule
gn2bp: Add helper function to get condition for arch
gn2bp: Update sanitizer to accept arch specific attributes
gn2bp: Add action attributes to arch
gn2bp: Add finalize function for non set attributes
gn2bp: Add helper function to finalize attributes
gn2bp: Update initial value of script and response_file_contents