[10]RFR: 6415680: (bf) MappedByteBuffer.get() can provoke crash with EXCEPTION_IN_PAGE_ERROR

[jamsheed]

Hi, request for review, jbs: 
https://bugs.openjdk.java.net/browse/JDK-6415680 webrev: 
http://cr.openjdk.java.net/~jcm/6415680/webrev.00/ Description: 1) 
changes equivalent to JDK-4454115 is done for windows. 2) added guard to 
multiple value access sites, Unsafe_CopyMemory0, Unsafe_SetMemory0 and 
Unsafe_CopySwapMemory0. 3) Unsafe_CopySwapMemory0 is JVM_LEAF so removed 
thread->thread_state() == _thread_in_vm checks from signal handler Best 
regards, Jamsheed

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