attempt to fix crashers when initializing the JVM #8380
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- clarify precondition for VirtualMachineEnv, in particular, JNI_OnLoad() must be called from a thread attached to the VM, and should be called once. This is now enforced internally, subsequent calls are ignored. - sVirtualMachine was written and read from potentially different threads without synchronization. It is now mutex protected. - added fatal asserts in all locations that we cannot recover from; previously we would stay in an undefined state. BUGS=[390724273]
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clarify precondition for VirtualMachineEnv, in particular, JNI_OnLoad() must be called from a thread attached to the VM, and should be called once. This is now enforced internally, subsequent calls are ignored.
sVirtualMachine was written and read from potentially different threads without synchronization. It is now mutex protected.
added fatal asserts in all locations that we cannot recover from; previously we would stay in an undefined state.
BUGS=[390724273]