There are a few intrinsics which are not tested.

We also don't test the emitted IR for most intrinsics, e.g. ctlz_nonzero could use ctlz without being noticed.

• pref_align_of: never used
• volatile_copy_nonoverlapping_memory: used in a test for write_volatile causes ICE with zero-sized types. #39827 without checking its output or IR
• volatile_copy_memory: ^
• volatile_set_memory: ^^
• unaligned_volatile_load: both IR and use with unaligned addr never checked
• unaligned_volatile_store: ^
• nearbyintf32: never used
• nearbyintf64: ^