[CodeGen] Add analyses to help for porting GC passes (#74972)

- `CollectorMetadataAnalysis` provides `GCStrategyMap`.
- `GCFunctionAnalysis` provides `GCFunctionInfo`.

`GCStrategyMap` owns `GCStrategy` pointers and this
pass is used by `AsmPrinter` to iterate all GC strategies.

Most passes that require `GCModuleInfo` actually require the
`GCFunctionInfo`,
so add `GCFunctionAnalysis` for convenience.