* src/vm/jit/powerpc/linux/md-abi.c,

* src/vm/jit/powerpc/linux/md-abi.c,
src/vm/jit/powerpc/darwin/md-abi.c (md_return_alloc): Use
m->parseddesc->paramcount instead of m->paramcount.
* src/vm/jit/schedule/schedule.c (schedule_init): Likewise.

* src/vm/jit/powerpc/codegen.c, src/vm/jit/alpha/codegen.c,
src/vm/jit/mips/codegen.c, src/vm/jit/i386/codegen.c (codegen):
Removed first MCODECHECK since it not required.

* src/vm/jit/methodheader.h: Added comment.