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`

Author: GuillaumeGomez

src/intrinsics/simd.rs

@@ -496,7 +496,8 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         | sym::simd_flog
         | sym::simd_flog10
         | sym::simd_flog2
-        | sym::simd_round => {
+        | sym::simd_round
+        | sym::simd_round_ties_even => {
             intrinsic_args!(fx, args => (a); intrinsic);
 
             if !a.layout().ty.is_simd() {
@@ -527,6 +528,8 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                     (sym::simd_flog2, types::F64) => "log2",
                     (sym::simd_round, types::F32) => "roundf",
                     (sym::simd_round, types::F64) => "round",
+                    (sym::simd_round_ties_even, types::F32) => "rintf",
+                    (sym::simd_round_ties_even, types::F64) => "rint",
                     _ => unreachable!("{:?}", intrinsic),
                 };
                 fx.lib_call(