Remove default value for atomic ref index

Author: ZzEeKkAa

numba_dpex/experimental/_kernel_dpcpp_spirv_overloads/_atomic_ref_overloads.py

@@ -584,7 +584,7 @@ def _check_if_supported_ref(ref):
 )
 def ol_atomic_ref(
     ref,
-    index=0,
+    index,
     memory_order=MemoryOrder.RELAXED,
     memory_scope=MemoryScope.DEVICE,
     address_space=AddressSpace.GLOBAL,
@@ -655,7 +655,7 @@ def ol_atomic_ref(
 
     def ol_atomic_ref_ctor_impl(
         ref,
-        index=0,
+        index,
         memory_order=MemoryOrder.RELAXED,  # pylint: disable=unused-argument
         memory_scope=MemoryScope.DEVICE,  # pylint: disable=unused-argument
         address_space=AddressSpace.GLOBAL,  # pylint: disable=unused-argument

numba_dpex/kernel_api/atomic_ref.py

@@ -18,7 +18,7 @@ class AtomicRef:
     def __init__(  # pylint: disable=too-many-arguments
         self,
         ref,
-        index=0,
+        index,
         memory_order=MemoryOrder.RELAXED,
         memory_scope=MemoryScope.DEVICE,
         address_space=AddressSpace.GLOBAL,