Revert "Use Int property for ScalarRangeInitialized."

This reverts commit f850771835f53bcb922eccd118fd9bb01e6c3ece.

This causes old Python scripts to fail. We need to get rid of
ScalarRangeInitialized entirely.

Change-Id: I128c23c1c463ecc67dbd171e44ab5400da537b79
Merge topic 'refactor_python_tracing_2' into next

cc3dcb7e Revert "Use Int property for ScalarRangeInitialized."