llvmpipe: orcjit: make the LPJit helper per-thread singleton
This MR makes the LPJit helper class in lp_bld_init_orc.cpp a per-thread singleton instead of a per-process one to fix at least some tests of #11511 .
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
This MR makes the LPJit helper class in lp_bld_init_orc.cpp a per-thread singleton instead of a per-process one to fix at least some tests of #11511 .