Fixup debug metadata in kernel fixup

The first kernel parameter also needs removing from the debug metadata,
so that the debug metadata argument types align with the arguments to
the fixed-up kernel.

numba_cuda/numba/cuda/compiler.py

@@ -352,6 +352,18 @@ def kernel_fixup(kernel, debug):
     kernel.return_value = ir.ReturnValue(kernel, ir.VoidType())
     kernel.args = kernel.args[1:]
 
+    # If debug metadata is present, remove the return value from it
+
+    if kernel_metadata := getattr(kernel, 'metadata', None):
+        if dbg_metadata := kernel_metadata.get('dbg', None):
+            for name, value in dbg_metadata.operands:
+                if name == "type":
+                    type_metadata = value
+                    for tm_name, tm_value in type_metadata.operands:
+                        if tm_name == 'types':
+                            types = tm_value
+                            types.operands = types.operands[1:]
+
     # Mark as a kernel for NVVM
 
     nvvm.set_cuda_kernel(kernel)