build

Implicit unboxed records #15374

Job	Run time
flambda2_runtime5	9m 15s
flambda2_dev	9m 13s
flambda2_dev_runtime5	9m 12s
flambda2_debug_runtime5	9m 15s
flambda2_debug_runtime	9m 15s
flambda2_o3	9m 13s
flambda2_o3_heap	9m 14s
flambda2_o3_advanced_meet_frame_pointers_runtime5_polling	9m 13s
flambda2_o3_advanced_meet_frame_pointers_runtime5_debug	9m 14s
flambda2_frame_pointers_oclassic_polling	9m 13s
flambda2_macos_arm64	9m 19s
flambda2_macos_arm64_runtime5_irc	5m 51s
flambda2_macos_arm64_runtime5_ls	6m 43s
flambda2_macos_arm64_gi	5m 52s
irc	9m 13s
irc_polling	9m 12s
irc_frame_pointers	9m 12s
ls	9m 12s
gi	9m 15s
cfg-selection	9m 15s
vectorizer	9m 12s
	3h 4m 33s

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