RFR 8224944 [lworld] TestCallingConventionC1::test63 fails with -Xcomp

[Ioi Lam]

https://bugs.openjdk.java.net/browse/JDK-8224944
http://cr.openjdk.java.net/~iklam/valhalla/8224944-c1-incorrect-vvep-ro-sharing.v01/

C1 tries to save space by avoiding the generation of the VVEP(RO) entry. 
However,
in some cases we cannot re-use the VEP for VVEP(RO) -- when some 
parameters are
passed on the stack, VEP has reserved entries, but VVEP(RO) doesn't.

I also fixed the printing of the nmethod entry point names after merging 
with
JDK-8213084 (Rework and enhance Print[Opto]Assembly output).

Thanks
- Ioi