add codegen test for rust-lang#110797

Author: tesuji

tests/codegen/issues/issue-110797-enum-jump-same.rs

@@ -0,0 +1,27 @@
+//@ compile-flags: -O
+// XXX: The x86-64 assembly get optimized correclty. But llvm-ir output is not until llvm 18?
+//@ min-llvm-version: 18
+
+#![crate_type = "lib"]
+
+pub enum K{
+    A(Box<[i32]>),
+    B(Box<[u8]>),
+    C(Box<[String]>),
+    D(Box<[u16]>),
+}
+
+#[no_mangle]
+// CHECK-LABEL: @get_len
+// CHECK: getelementptr inbounds
+// CHECK-NEXT: load
+// CHECK-NEXT: ret i64
+// CHECK-NOT: switch
+pub fn get_len(arg: &K)->usize{
+    match arg {
+        K::A(ref lst)=>lst.len(),
+        K::B(ref lst)=>lst.len(),
+        K::C(ref lst)=>lst.len(),
+        K::D(ref lst)=>lst.len(),
+    }
+}