[API Compatibility No.114] support torch.masked_fill(input=...) with change-prefix mapping -part

[Aidenwu0209]

PR Docs

• docs PR: [API Compatibility No.114] update torch.masked_fill docs for input kwarg compatibility -part docs#7753

PR APIs

torch.masked_fill

Description

• Switch torch.masked_fill mapping from GenericMatcher to ChangePrefixMatcher.
• Keep regression coverage for keyword style by checking converted code for input= scenarios.

Test

• python -m pytest tests/test_masked_fill.py -q

[paddle-bot]

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