JNI spec needs to be updated for 1.6

I have recently putback fixes to two VM bugs which require
changes to the JNI specification for the Mustang or 1.6
release of J2SE.

bugid 4725563
bugid 5105765

Bug 5105765 requires a clarification of the use of the MXCSR register
for JNI native code on x86 and AMD64 platforms. The native
ABI on all but Windows AMD64 does not specify if this register is
a callee or caller saved register and in order to provide high
performance calls to JNI code, we'd prefer to treat this register
as callee saved.

bugid 4725563 add a new JNI call GetObjectRefType that is documented
in the bug report.

We have bumped the JNI version to JNI_VERSION_1_6 for the
mustang release so developers can detect that this new
API is available.



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