Fix `CanUseKnownBootImageVarHandle()`.

The first input to `HStaticFieldGet` in not necessarily an
`HLoadClass`. It can be also `HClinitCheck`.

Test: Rely on TreeHugger.
Bug: 191765508
Bug: 230729606
Change-Id: Ib05b0c8a74809698cb5084349959efac4e8f35a7
1 file changed