Sub-Tasks:

• SR-9014 Pattern matching doesn't work for overloaded enum cases
• SR-12229 Assertion failure when trying to pattern match enum cases with same base name
• SR-12206 Symbol collision when multiple enum cases with same base name have default arguments
• SR-11159 Typechecker crash on overloaded enum case
• SR-5852 Compilation failure for overloaded enum initializers with whole module optimization turned on
• SR-15453 Symbol collision in enum case initializers in library evolution mode

Issue Description:

This is an umbrella report to collect other bug reports related to issues with overloaded enum cases.