A run-pass test has conflicting repr hints

[pnkfelix]

The following code hits the lint that warns about conflicting repr hints on a datatype.

rust/src/test/run-pass/issue-39720.rs

Lines 15 to 23 in c2afca3

	#[repr(C)]
	#[repr(simd)]
	#[derive(Copy, Clone, Debug)]
	pub struct char3(pub i8, pub i8, pub i8);
	#[repr(C)]
	#[repr(simd)]
	#[derive(Copy, Clone, Debug)]
	pub struct short3(pub i16, pub i16, pub i16);

(I'm just filing this ticket so I have something to point at from a PR for #53764.)

[Enselic]

Fixed by https://github.com/rust-lang/rust/pull/67770/files#diff-4a4d51d87ccad2714c791293302c0b146e8c9292fbf59bbfddd5a927b78dcf2c