[pmc] rpa: fix invalid read in delete_keyed_int, off by one

with (1,9,10) and key=1 we read one too far.
repro:
  valgrind ./parrot_old -t20 t/compilers/pge/p5regex/p5rx.t
[pmc] rpa: shift optim, use data struct directly

do not use seperate SELF and temp values for the attrs.
2.40% faster on my mac, %ebp addressing for data.
[pmc] rpa: internal rename trace macros

add TRACE_RPAdata