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avoid quadratic member lookups in table and alias visitors #1172

Job	Run time
Grammar Choice Conflicts	29s
Gradle Check (windows-latest)	3m 7s
Gradle Check (macos-latest)	2m 46s
Gradle Check (ubuntu-latest)	3m 21s
Maven Verify (windows-latest)	3m 2s
Maven Verify (macos-latest)	4m 6s
Maven Verify (ubuntu-latest)	4m 1s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	20m 52s