Add additional rehashing for small sets #7356

Job	Run time
Build Jupyter Kernel	3m 28s
Build LPython to WASM	5m 52s
LPython CI (3.10, ubuntu-latest)	8m 43s
Test CPython Interop (@pythoncall)	1m 34s
LPython CI (3.10, macos-latest)	8m 53s
Check Debug build	2m 25s
LPython CI (3.10, windows-2019)	13m 18s
Run Integration tests with Python 3.9	1m 50s
Run Integration tests with Python 3.10	1m 46s
Check Release build	2m 30s
Run SymPy tests	2m 12s
Run Integration tests with Python 3.11	1m 49s
Test PIP Installable Packages	1m 28s
Run Integration tests with Python 3.12	1m 39s
Upload Tarball	38s
	58m 5s

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