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Auto merge of rust-lang#123167 - DianQK:test-simd-wide-sum, r=scottmcm

Restore the test checks for `wider_reduce_into_iter` The current minimum support is for LLVM 17. Context: rust-lang#116018 (comment). r? scottmcm

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Original file line number	Diff line number	Diff line change
`@@ -51,8 +51,8 @@ pub fn wider_reduce_iter(x: Simd<u8, N>) -> u16 {`
`51`	`51`	`#[no_mangle]`
`52`	`52`	`// CHECK-LABEL: @wider_reduce_into_iter`
`53`	`53`	`pub fn wider_reduce_into_iter(x: Simd<u8, N>) -> u16 {`
`54`		`- // FIXME: It would be nice if this was exactly the same as the above tests,`
`55`		`- // but at the time of writing this comment, that didn't happen on LLVM main.`
`56`		`- // CHECK: call i16 @llvm.vector.reduce.add`
	`54`	`+ // CHECK: zext <16 x i8>`
	`55`	`+ // CHECK-SAME: to <16 x i16>`
	`56`	`+ // CHECK: call i16 @llvm.vector.reduce.add.v16i16(<16 x i16>`
`57`	`57`	`x.to_array().into_iter().map(u16::from).sum()`
`58`	`58`	`}`

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