Automated rollback of 67517b5a5b7627eee39a47917197998b9f974751.
Automated rollback of 67517b5a5b7627eee39a47917197998b9f974751.

*** Reason for rollback ***

Causing Sheets iOS crash

*** Original change description ***

Fix memory leaks and potential crashes in HashBiMap, which occur in transpiled ObjC code.
Add iOS specific unit tests in XPlat, because Guava is missing infrastructure for iOS tests.

***

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=345445573

google/guava,google/guava,mosoft521/guava,mosoft521/guava,google/guava,mosoft521/guava,typetools/guava,typetools/guava