- Do the actual work of implementing idx() in PHP
- Remove the old C++ builtin (which needs to be done at the same time)
- Remove OSS test dependencies on idx()
Only rematerialize an instruction if its inputs are still live
and in registers at the point we're cloning it, which, given the current state of flux in the register allocator, is restricted for
now to just instructions that consume rVmSp, rVmFp, or immediate constants.
Sean Cannella