`size_of_val` and `min_align_of_val` intrinsics should be unsafe

[tmiasko]

The unsafe functions size_of_val_raw & align_of_val_raw are implemented using
size_of_val and min_align_of_val intrinsics, which are currently considered to
be safe.

The #69079 changed the API of those intrinsics to accept raw pointers instead
of references, but didn't update the safety of those intrinsics (the discussion
regarding safety can be found in aforementioned PR).

Function describing safety of intrinsics that needs to be updated (this will
also need to be accompanied by changes in the standard library):

rust/compiler/rustc_typeck/src/check/intrinsic.rs

Lines 66 to 67 in 8018418

	| sym::size_of_val
	| sym::min_align_of_val