[FRONTEND] Bunch of fixes here and there (#436)

python/test/unit/language/test_core.py

@@ -79,7 +79,7 @@ def to_numpy(x):
 
 
 def patch_kernel(template, to_replace):
-    kernel = copy.deepcopy(template)
+    kernel = triton.JITFunction(template.fn)
     for key, value in to_replace.items():
         kernel.src = kernel.src.replace(key, value)
     return kernel

python/test/unit/runtime/test_cache.py

@@ -39,9 +39,9 @@ def kernel_nospec(X, i, BLOCK: tl.constexpr):
 
 
 def apply_src_change(target, old, new):
-    delattr(kernel.fn, 'hash')
-    delattr(function_1.fn, 'hash')
-    delattr(function_2.fn, 'hash')
+    kernel.hash = None
+    function_1.hash = None
+    function_2.hash = None
     function_1.src = function_1.src.replace(old, new)
     target.src = target.src.replace(old, new)
     ret = target.cache_key