tests: codegen-llvm: vec-calloc: do not require the uwtable attribute

The uwtable attribute does not get emitted on targets that don't have
unwinding tables, such as x86_64-unknown-hermit.

Author: Gelbpunkt

tests/codegen-llvm/vec-calloc.rs

@@ -199,4 +199,4 @@ pub fn vec_array(n: usize) -> Vec<[u32; 1_000_000]> {
 // Ensure that __rust_alloc_zeroed gets the right attributes for LLVM to optimize it away.
 // CHECK: declare noalias noundef ptr @{{.*}}__rust_alloc_zeroed(i64 noundef, i64 allocalign noundef range(i64 1, -9223372036854775807)) unnamed_addr [[RUST_ALLOC_ZEROED_ATTRS:#[0-9]+]]
 
-// CHECK-DAG: attributes [[RUST_ALLOC_ZEROED_ATTRS]] = { {{.*}} allockind("alloc,zeroed,aligned") allocsize(0) uwtable "alloc-family"="__rust_alloc" {{.*}} }
+// CHECK-DAG: attributes [[RUST_ALLOC_ZEROED_ATTRS]] = { {{.*}} allockind("alloc,zeroed,aligned") allocsize(0) {{(uwtable )?}}"alloc-family"="__rust_alloc" {{.*}} }