Add checks for non-builtin function

Author: winstonallo

tests/assembly-llvm/regparm-module-flag.rs

@@ -13,14 +13,25 @@ use minicore::*;
 
 unsafe extern "C" {
     fn memset(p: *mut c_void, val: i32, len: usize) -> *mut c_void;
+    fn non_builtin_memset(p: *mut c_void, val: i32, len: usize) -> *mut c_void;
 }
 
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn entrypoint(len: usize, ptr: *mut c_void, val: i32) -> *mut c_void {
+    // CHECK-LABEL: entrypoint
+    // CHECK: mov{{.*}}eax
+    // CHECK: mov{{.*}}ecx
+    // CHECK: mov{{.*}}esi
+    // CHECK: jmp{{.*}}memset
     unsafe { memset(ptr, val, len) }
 }
 
-// CHECK: mov{{.*}}eax
-// CHECK: mov{{.*}}ecx
-// CHECK: mov{{.*}}esi
-// CHECK: jmp{{.*}}memset
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn non_builtin_entrypoint(len: usize, ptr: *mut c_void, val: i32) -> *mut c_void {
+    // CHECK-LABEL: my_entrypoint
+    // CHECK: mov{{.*}}eax
+    // CHECK: mov{{.*}}ecx
+    // CHECK: mov{{.*}}esi
+    // CHECK: jmp{{.*}}memset
+    unsafe { non_builtin_memset(ptr, val, len) }
+}