Request for reviews (M): 7059034: Use movxtod/movdtox on T4

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7059034/webrev

Fixed 7059034: Use movxtod/movdtox on T4

Currently VM uses stack to move data between general and float registers on 
Sparc. Use new VIS3 mov instructions on T4 for such moves.

I removed R_F30,R_F31 from dflt_low_reg since they used as temps (see line 412).
Also fixed float<->integer conversion instructions since they used incorrect 
Width for float register encoding. For example, encoding failed for next instr 
ftoi(FloatRegisterImpl::D,F4,F1) and fitof(FloatRegisterImpl::D,F1,F8).

Tested with CTW, nsk.
I attached microbenchmark test to the bug report.