Rollup merge of #137556 - RalfJung:simd_shuffle_const_generic, r=oli-obk

rename simd_shuffle_generic → simd_shuffle_const_generic

I've been confused by this name one time too often. ;)

r? `@oli-obk`

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -1329,7 +1329,7 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
         ));
     }
 
-    if name == sym::simd_shuffle_generic {
+    if name == sym::simd_shuffle_const_generic {
         let idx = fn_args[2].expect_const().to_value().valtree.unwrap_branch();
         let n = idx.len() as u64;