RFR(M): 8034080 Remove the USDT1 dtrace code from Hotspot

[Staffan Larsen]

Now that both the Solaris (JDK-8030812) and the Linux (JDK-8032462) implementations have moved to USDT2, we can finally remove the USDT1 code from hotspot.

There are quite a lot of changes in this review, and webrev barfed on the number of change in jni.cpp so that file can only be reviewed from the patch file. The good news is that the changes are mostly trivial removal of #ifdef:ed code.

bug: https://bugs.openjdk.java.net/browse/JDK-8034080
webrev: http://cr.openjdk.java.net/~sla/8034080/webrev.00/

Testing: I have run jck-runtime, vm.quick.testlist and vm.dtrace.testlist on Solaris and OS X. 

/Staffan