[FRONTEND] Better cache hook (#400)

Added an additional `repr` argument to the cache hook, which represents a human-readable string representation of the signature and argument attributes associated with the compiled binary.

python/test/unit/runtime/test_cache.py

@@ -64,20 +64,21 @@ def reset_tmp_dir():
 
 def test_reuse():
     counter = 0
-    def inc_counter(key, binary):
+    def inc_counter(key, binary, repr):
         nonlocal counter
         counter += 1
     JITFunction.cache_hook = inc_counter
     reset_tmp_dir()
     x = torch.empty(1, dtype=torch.int32, device='cuda')
     for i in range(10):
-        kernel[(1,)](x, 43, BLOCK=1024)
+        kernel[(1,)](x, 1, BLOCK=1024)
     assert counter == 1
+    
 
 @pytest.mark.parametrize('mode', ['enable', 'disable'])
 def test_specialize(mode):
     counter = 0
-    def inc_counter(key, binary):
+    def inc_counter(key, binary, repr):
         nonlocal counter
         counter += 1
     JITFunction.cache_hook = inc_counter