llvm: Fix array ABI test to not check equality implementation

LLVM has moved memcmp expansion in the pipeline, resulting in the bcmp
call being expanded into loads and register comparisons, which breaks
the test.

Based on history, I believe the test actually intended validate that
these arrays were being passed as pointer arguments, which can be done
more directly.

tests/codegen-llvm/array-equality.rs

@@ -1,3 +1,6 @@
+//@ revisions: llvm-current llvm-next
+//@[llvm-current] ignore-llvm-version: 23-99
+//@[llvm-next] min-llvm-version: 23
 //@ compile-flags: -Copt-level=3 -Z merge-functions=disabled
 //@ only-x86_64
 #![crate_type = "lib"]
@@ -26,9 +29,18 @@
 #[no_mangle]
 pub fn array_eq_value_still_passed_by_pointer(a: [u16; 9], b: [u16; 9]) -> bool {
     // CHECK-NEXT: start:
-    // CHECK: %[[CMP:.+]] = tail call i32 @{{bcmp|memcmp}}(ptr {{.*}} dereferenceable(18) %{{.+}}, ptr {{.*}} dereferenceable(18) %{{.+}}, i64 18)
-    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[CMP]], 0
-    // CHECK-NEXT: ret i1 %[[EQ]]
+    // CHECK-NOT: alloca
+    // llvm-current-NEXT: %[[CMP:.+]] = tail call i32 @{{bcmp|memcmp}}(ptr
+    // llvm-current-SAME: {{.*}} dereferenceable(18) %{{.+}}, ptr {{.*}} dereferenceable(18)
+    // llvm-current-SAME: %{{.+}}, i64 18)
+    // llvm-current-NEXT: %[[EQ:.+]] = icmp eq i32 %[[CMP]], 0
+    // llvm-current-NEXT: ret i1 %[[EQ]]
+    // CHECK-NOT: call
+    // New LLVM expands the bcmp earlier, so this becomes wide reads + icmp
+    // No allocas or calls, and at least one icmp
+    // llvm-next: icmp
+    // CHECK-NOT: alloca
+    // CHECK-NOT: call
     a == b
 }