Auto merge of #116609 - eduardosm:bump-stdarch, r=workingjubilee

Bump stdarch submodule and remove special handling for LLVM intrinsics that are no longer needed

Bumps stdarch to pull rust-lang/stdarch#1477, which reimplemented some functions with portable SIMD intrinsics instead of arch specific LLVM intrinsics.

Handling of those LLVM intrinsics is removed from cranelift codegen and miri.

cc `@RalfJung` `@bjorn3`

Author: bors

Diff for: src/intrinsics/llvm_x86.rs

@@ -32,41 +32,6 @@ pub(crate) fn codegen_x86_llvm_intrinsic_call<'tcx>(
             ret.write_cvalue(fx, CValue::by_val(res, fx.layout_of(fx.tcx.types.i64)));
         }
 
-        // Used by `_mm_movemask_epi8` and `_mm256_movemask_epi8`
-        "llvm.x86.sse2.pmovmskb.128"
-        | "llvm.x86.avx2.pmovmskb"
-        | "llvm.x86.sse.movmsk.ps"
-        | "llvm.x86.sse2.movmsk.pd" => {
-            intrinsic_args!(fx, args => (a); intrinsic);
-
-            let (lane_count, lane_ty) = a.layout().ty.simd_size_and_type(fx.tcx);
-            let lane_ty = fx.clif_type(lane_ty).unwrap();
-            assert!(lane_count <= 32);
-
-            let mut res = fx.bcx.ins().iconst(types::I32, 0);
-
-            for lane in (0..lane_count).rev() {
-                let a_lane = a.value_lane(fx, lane).load_scalar(fx);
-
-                // cast float to int
-                let a_lane = match lane_ty {
-                    types::F32 => codegen_bitcast(fx, types::I32, a_lane),
-                    types::F64 => codegen_bitcast(fx, types::I64, a_lane),
-                    _ => a_lane,
-                };
-
-                // extract sign bit of an int
-                let a_lane_sign = fx.bcx.ins().ushr_imm(a_lane, i64::from(lane_ty.bits() - 1));
-
-                // shift sign bit into result
-                let a_lane_sign = clif_intcast(fx, a_lane_sign, types::I32, false);
-                res = fx.bcx.ins().ishl_imm(res, 1);
-                res = fx.bcx.ins().bor(res, a_lane_sign);
-            }
-
-            let res = CValue::by_val(res, fx.layout_of(fx.tcx.types.i32));
-            ret.write_cvalue(fx, res);
-        }
         "llvm.x86.sse.cmp.ps" | "llvm.x86.sse2.cmp.pd" => {
             let (x, y, kind) = match args {
                 [x, y, kind] => (x, y, kind),