Bug: 323382414 Test: go test Change-Id: I0d4cf391a1a625c5160456db1f4f7fa424c2141e
Split the context methods that are useful on anything visiting a module that has arch variants into a separate ArchMutatorContext for reuse by TranstitionMutators. Bug: 319288033 Test: builds Change-Id: Ifdc21983c6c79f22965a49f169812a8cc3ad975b