Add ETDump failure to improve exception handling (#13069)

Summary:

As titled.

Reviewed By: hsharma35

Differential Revision: D79265023

Author: mcremon-meta

backends/cadence/aot/utils.py

@@ -45,6 +45,10 @@ def __init__(self, rms_expected_value: float) -> None:
         super().__init__()
 
 
+class ISSRuntimeFailure(Exception):
+    pass
+
+
 # Get the output size of a 1D convolution given the input size and parameters
 def get_conv1d_output_size(
     in_size: torch.Size,