review for 7088020: SEGV in JNIHandleBlock::release_block

[Tom Rodriguez]

http://cr.openjdk.java.net/~never/7088020
150 lines changed: 88 ins; 50 del; 12 mod; 10143 unchg

7088020: SEGV in JNIHandleBlock::release_block
Reviewed-by:

The throw_WrongMethodTypeException stub on x64 needs to align the
stack before calling into the runtime or it might crash.  I also
noticed that two stubs were dead which made an extra argument dead so
I cleaned that up at the same time.  Tested on linux-amd64 with new
regression test and failing tests from report.