Don't require tool name in backfill behaviour #97

Job	Run time
windows-latest-default-Release	3m 0s
windows-latest-default-Debug	6m 38s
windows-latest-llvm-arm64-Release	4m 47s
windows-latest-llvm-arm64-Debug	4m 38s
windows-latest-msvc-arm64-Release	4m 44s
windows-latest-msvc-arm64-Debug	5m 38s
macos-latest-default-Release	3m 30s
macos-latest-default-Debug	5m 34s
ubuntu-latest-default-Release	3m 34s
ubuntu-latest-default-Debug	3m 49s
	45m 52s

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