Rollup merge of #142078 - sayantn:more-intrinsics, r=workingjubilee

Add SIMD funnel shift and round-to-even intrinsics

This PR adds 3 new SIMD intrinsics

 - `simd_funnel_shl` - funnel shift left
 - `simd_funnel_shr` - funnel shift right
 - `simd_round_ties_even` (vector version of `round_ties_even_fN`)

TODO (future PR): implement `simd_fsh{l,r}` in miri, cg_gcc and cg_clif (it is surprisingly hard to implement without branches, the common tricks that rotate uses doesn't work because we have 2 elements now. e.g, the `-n&31` trick used by cg_gcc to implement rotate doesn't work with this because then `fshl(a, b, 0)` will be `a | b`)

[#t-compiler > More SIMD intrinsics](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/More.20SIMD.20intrinsics/with/522130286)

`@rustbot` label T-compiler T-libs A-intrinsics F-core_intrinsics
r? `@workingjubilee`

compiler/rustc_hir_analysis/src/check/intrinsic.rs

@@ -594,8 +594,9 @@ pub(crate) fn check_intrinsic_type(
         | sym::simd_ceil
         | sym::simd_floor
         | sym::simd_round
+        | sym::simd_round_ties_even
         | sym::simd_trunc => (1, 0, vec![param(0)], param(0)),
-        sym::simd_fma | sym::simd_relaxed_fma => {
+        sym::simd_fma | sym::simd_relaxed_fma | sym::simd_funnel_shl | sym::simd_funnel_shr => {
             (1, 0, vec![param(0), param(0), param(0)], param(0))
         }
         sym::simd_gather => (3, 0, vec![param(0), param(1), param(2)], param(0)),